To Set the Purpose of an External Simplified Representation Component
This procedure determines if components within an external simplified representation are modifiable or not. Feature and component operations cannot be carried out on components specified for reference use.
1. Open an external simplified representation and select a top-level component from the Model Tree.
2. Click Set For Ref. Only to use components as references.
To make the component modifiable again, select it, and click Set Modifiable.
Set For Ref. Only to use components as references.
To make the component modifiable again, select it, and click 
Set Modifiable.