Activate Part Body command
Activate Part Body command
You can only add or remove features on the active solid body. All inactive solid bodies are ignored during feature modeling. Use the Activate part body command to activate a solid body in order to perform feature editing.
Note:
Even though you can only add or remove features from the active solid body, all solid body faces in the file participate in synchronous move operations.
For example, you can:
Right-click on a design body face and choose the Activate Body command .
In PathFinder, right-click on a design body and choose the Activate Body command .
In PathFinder, the active design body has an active body icon 
in front of the design body name.