Assign
Use Assign to manually assign constraints to elements.
To assign a constraint:
1. Click Parametric and then, in the Create group, click 
Constraints.
Constraints.The Generate Constraints dialog box opens.
2. In the Action area, click Assign.
3. In the Type box, select a constraint type (for example, Angle).
4. Click Apply.
5. Select the required geometry for the constraint type.
6. If applicable, type a value or parameter name for the constraint in the user input line and press ENTER.
7. Continue to select geometry, select a new constraint type, or click 
OK.
OK.When you successfully assign a constraint, one or more icons appear on the part to identify the type and identification number of that constraint. The leader line of the icon is drawn in the same linestyle as the element it references.
 | When you use Assign to assign a constraint to a piece of geometry, the constraint is bound to that element and goes with it whenever it is moved. Thus, you can move elements in a part after assigning constraints without invalidating the constraints. On the other hand, if you delete a constrained element, all constraints on that element are removed along with it. |
Some constraint types can be given numeric or parametric values when they are assigned. If you give a numeric value, the constraint will resolve to that value at solve time. If you give a parameter name or expression, the constraint resolves to the output of that parameter or expression at solve time. If you choose not to supply either a value or parameter, the constraint resolves to the corresponding value that is currently on the element at solve time. If a value or parameter name is assigned to a constraint, that data will appear along with the constraint's icon whenever it is displayed. See Parameters for a full discussion of how numeric values and parameters affect constraints.