Symmetry Line
The Symmline constraint identifies a line of symmetry that can be used by Complete to assign mirror constraints. If you want to assign mirror constraints by hand, you should use Assign Mirror instead. You assign Symmline constraints to linear elements, which are then labeled with the symmetry line icon. See Constraint Icons.
To assign Symmline constraints:
1. In the Generate Constraints dialog box, click the Assign radio button. Then pull down the Type selection list and select Symmline.
2. Click Apply.
3. Click the linear element to be constrained.
4. Click End or assign the next constraint.
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