Part Modeling > Modifying the Part > Flexible Parts > To Define a Flexible Part
  
To Define a Flexible Part
You must define varied items to make a part flexible. When placing the part in an assembly, all or some of the varied items receive values that define the flexibility of the part. Additional varied items can be added in Assembly mode.
1. Create the part you want to make flexible.
2. Click File > Prepare > Model Properties. The Model Properties dialog box opens.
3. Click change in the Flexible line. The Flexibility: Prepare Varied Items dialog box opens.
4. Choose the desired tab and select an item at the prompt. Click to add it to the items list.
5. Continue adding or removing varied items to define all those required. Multiple varied items of multiple types can be defined.
6. Click OK. The part has predefined flexibility.