To Define a Nested Interface
1. In an open assembly, click 
Component Interface. The COMPONENT INTERFACE dialog box opens.
Component Interface. The COMPONENT INTERFACE dialog box opens.2. Select Nested from the Constraint Type list. The name of the constraint changes to Nested followed by a number.
3. Select an interface from the Model Tree footer. A reference table appears and displays the geometric references for the selected interface.
4. Add additional references to the nested interface. Only interfaces can be selected as references.
5. Click OK.