To Create an Inheritance Feature
1. Retrieve an assembly, select a part in it, right-click, and choose Activate.
2. Select a second part in the assembly as the reference model from which geometry will be copied and click Get Data > Merge/Inheritance. The Merge/Inheritance tab opens with the reference model selected by default. You can select a different part as the reference model from the Model Tree or in the graphics window.
3. Click
to toggle between Merge mode (default) and Inheritance mode.
4. Use the following options to define inheritance feature properties:
◦ 
—Add (default) or remove material geometry.
◦ 
—Set reference type to assembly context (default).
◦ 
—Set reference type to external.
◦ Click Options to change the following options:
▪ Automatic Update—Keeps the relationship between the current feature and the original geometry.
▪ Manual Update—Temporarily suspends the relationship between the current feature and the original geometry. If the original part changes, the current feature does not change.
▪ No Dependency—Creates a frozen feature.
▪ Varied Items—Define varied items properties.
▪ Refit Datums—Change the size or reference of copied datums.
◦ Click Properties to change the name of the Inheritance feature.
5. Click
to complete the Inheritance feature.