How to Create a Derived Part in SOLIDWORKS

A derived part is created from an existing part so the new file can reference geometry from the original. It is useful for related parts, left-hand and right-hand versions, simplified manufacturing models, tooling references, or designs that need to stay linked to a master part.

When to use a derived part

Use a derived part when the new part should stay connected to the original design. If the new part needs to become completely independent, a normal copy may be better. A derived part is powerful because changes to the source can update the derived file, but that link also needs to be managed carefully.

Typical examples include opposite-hand parts, cast and machined versions, simplified envelope parts, and tooling references. In each case, the derived file benefits from starting with the source geometry instead of recreating everything manually.

Create the derived part

1. Open or select the source part.
2. Use Insert Part or the derived part workflow needed for your design.
3. Select what to bring into the new file.
4. Choose whether to include bodies, planes, sketches, or custom properties.
5. Save the new part with a clear name.

Choose what to transfer

You may not need every item from the source part. Bring in the bodies and references that support the new part. Too many transferred sketches, planes, or properties can make the derived file harder to understand.

For a clean derived part, include only the geometry and references that have a purpose. If a sketch, plane, or body is not needed downstream, leaving it out can make the new file easier to maintain.

Manage the link to the source

The link to the original part is the main advantage of a derived part. If the source changes, the derived part can update. Before using this in production, decide who controls the source part and how changes will be reviewed.

This is especially important in shared folders or PDM systems. A source part edit can affect every derived part that depends on it, so the relationship should be intentional and documented.

Use derived parts carefully in drawings

If the derived part has its own drawing, check dimensions, custom properties, material, and part number. Do not assume every property from the source should carry into the new part. A derived manufacturing version may need different notes or metadata.

Open the drawing after major source changes. Even if the derived model rebuilds, drawing dimensions and annotations may need review because the derived geometry has changed.

Troubleshooting

If the derived part does not update, check the source file reference and rebuild the model. If the wrong geometry appears, edit the inserted part feature and review the included bodies or features. If the link creates too much risk, save an independent copy for that specific use.

Derived parts are most useful when the relationship between the source and new part is intentional. Name files clearly and document the design relationship so future edits do not surprise the next user.

If the relationship is temporary, consider breaking the link or saving an independent copy once the design is stable. That prevents later source changes from affecting a released part unexpectedly.