Reference Element
Any element in a part (except ellipses) can be fixed in place with a Ref Elem constraint. Reference elements are not changed in any way by SOLVE, so they will appear in the same position in the variation as they do in the master part.
To assign Ref Elem constraints:
1. Select ASSIGN on MENU 2.
2. Select type Ref Elem.
3. Pick the element to be constrained.
4. Press END or assign the next constraint.
Reference elements are labeled with the anchor icon,
Constraint Icons.