Choose a CAD Continuity Strategy: Native, Referenced, Converted, or Rebuilt

Choose the continuity strategy from the change and update relationship you need, not from the extension alone. The central decision is who owns the next change and whether changes made elsewhere must continue to arrive.

Compare the strategy classes

Strategy	Change authority	Update behavior	What the recipient can reasonably expect	Main risk
Native continuity	The source authoring system or a compatible native workflow	Native dependencies and history remain under that workflow	The highest chance of retaining source-defined features and relationships, subject to release and configuration compatibility	The recipient may not have the application, release, licenses, references, or authority needed to work independently
Linked or referenced model	Usually the source file and its owning system	The destination monitors and incorporates source changes when the link works	A current reference plus destination-side work around it; not necessarily editable source definitions	Missing dependencies, orphaned surfaces, retranslation differences, and edits that are not allowed on the referenced geometry
Converted geometry	The destination owns a new independent result	Source and destination changes are separate	A base solid or surface that can be adjusted and extended with destination tools	The original base-feature definition, history, constraints, and associativity may not be editable
Selective reconstruction	The destination owns explicitly rebuilt change-driving areas	Updates require an agreed manual or scripted reconciliation unless another link is retained	Parametric control where it was deliberately recreated	The rebuilt portion may diverge from source intent or from unchanged received geometry
Full rebuild	The destination owns a new authoring definition	Independent of the source after the handoff unless a separate comparison process is maintained	A model organized for repeated destination-native changes	Reconstruction effort, interpretation errors, and loss of traceability to the received shape

These are strategy classes, not universal product modes. Product labels such as “reference,” “convert,” “direct edit,” and “interconnect” have to be read in their specific release and file-type context.

Native continuity

Use native continuity when the source authoring system remains the change authority or when the exchange must preserve a feature-based definition for repeated edits. Agree on the application release, required add-ins or references, ownership, and how the recipient will receive updates. A file that is native to the source system may still fail in an earlier release or in a session without its dependencies.

For example, Autodesk’s 2026 Inventor FAQ documents a sequential-version reference workflow: an earlier Inventor release can open a part or assembly from the next release as a reference model, but it cannot access or edit features from the newer release. The earlier release can see later changes after a prompted rebuild. This is a bounded release behavior, not a general rule for every native CAD system.

Linked or referenced models

Use a reference when the destination needs current source geometry or context but does not need to edit the referenced definition. Autodesk describes Inventor Reference Model as maintaining a link that can be monitored and updated. Its documentation also limits what can be changed depending on whether the import is in a part or assembly: imported geometry can be edited in a part context, while the imported geometry itself cannot be modified in the documented assembly context.

The link is a dependency, not a guarantee. Autodesk documents that a STEP reference update is a new translation and can create unresolved geometry or prevent Inventor changes from updating correctly. Its association guidance also describes orphaned surfaces when source and destination objects no longer match. Plan for missing files, update ownership, link breakage, and a recovery or acceptance decision.

SOLIDWORKS 2026 describes 3D Interconnect as an associative link for inserting supported proprietary CAD data without converting it to a SOLIDWORKS file, with update and break-link operations. Its format and version table is route context; a listed row does not prove that a particular model supports the required edit or that source history is preserved.

Onshape illustrates why the update scope must be tested rather than assumed. Its documentation says an updated imported part changes the target Part Studio and reapplies target features where possible, but those features can enter an error state. The Assembly is not updated by this workflow and remains at its earlier state. If assemblies or instances matter, make them a separate acceptance check and name the fallback when the Part Studio and Assembly no longer agree.

Creo Parametric 13 exposes a related set of route-state controls: an imported feature can be reloaded or replaced, original and new geometry can be compared, and reference entities can be matched. Profile options such as import type and ATB are initial-import settings; resetting them during redefinition does not change how the source reload behaves. Record the imported geometry type, configuration, profile, and reference-matching result instead of treating a reload command as proof of continuity.

Converted geometry

Use conversion when the destination needs independent geometry for a new design, and a source update relationship is not required. Autodesk’s AnyCAD Convert Model creates a new Inventor file that is not linked to the original. The resulting base features can represent source geometry and topology, and destination commands can adjust them or add new features, but the original base-feature definition is not thereby an editable source history.

Record the import mode, filters, units, assembly or part option, source and destination releases, and translator report. In Inventor 2026, object filters distinguish solids, surfaces, meshes, graphical PMI, wires, work features, points, and UCS; the documentation says mesh data is for visualization only. Such filters affect what is available to edit later.

Autodesk Fusion documents another destination-side boundary. Parametric Modeling Mode records features and relationships in a timeline, while Direct Modeling Mode does not capture them as parametric history. A Base Feature permits direct edits inside a parametric design, but those edits are not tracked parametrically; switching back from Direct Modeling captures the result as one Base Feature rather than reconstructing individual history. Treat the selected mode as part of the continuity decision, not as a neutral presentation setting.

Selective reconstruction or a full rebuild

Rebuild when the receiving team needs independent, repeated, or extensive control that the imported representation cannot provide. PTC’s Creo guidance gives two useful patterns: recreate the entire model parametrically when geometry must change extensively or often, or recreate only important portions that change frequently. The selective option limits parametric functionality to those portions; the documentation does not provide a universal cost threshold.

A selective rebuild often preserves a stable received shape while rebuilding the mounting interface, change-driving sketch, or other high-variation region. Keep the received file, identify what was rebuilt, and verify the resulting model against the required dimensions, dependencies, and downstream output. Treat the new definition as a destination interpretation unless equivalence to the source is specifically demonstrated.

A decision sequence

1. Name the next change and who must perform it.
2. Decide whether source updates are required, optional, or forbidden.
3. Identify the information layers that must remain controllable: geometry, constraints, configurations, assembly references, PMI, or other semantics.
4. Select native, referenced, converted, selective-rebuild, or full-rebuild handling.
5. Capture release, direction, file type/profile, import options, dependencies, and logs.
6. Run the representative editability acceptance tests, including an update test only when the route requires one.

Key points

• A live link solves an update problem, not automatically an edit-authority problem.
• Converted geometry supports independent destination work but does not imply editable source history.
• Rebuilding is a valid interoperability outcome when control and ownership matter more than preserving the original definition.
• Every strategy needs a defined fallback for missing references, failed updates, or a change that the received representation cannot support.