You can replace a shared parameter with a family parameter or a family parameter with a shared parameter. 
Family parameters are specific to one family. You can also replace one shared parameter with another. 
- Open a family for editing. 
- In the drawing area, select the object. 
- Click Modify | <object) tab Properties panel Properties panel  (Family Types). (Family Types).
- In the Family Types dialog, select the parameter you wish to replace. 
- Click Modify. 
- In the Parameter Properties dialog, select a shared parameter or create a family parameter to replace the existing parameter, as desired. 
- Click OK.  The parameter name appears in the Family Types dialog. 
- Click OK.