If a point, curve, arc, or other object was left out of the Main Path when you created your detail, you can add it later.
In Detail Mode, name your detail in the Labels category, Piece Label Data tab
In Draw Mode/Detail group, select the Insert Node tool. A dialog box will NOT appear:
Left-click on the object to add into your detail piece. The dialog box appears. Select your detail piece in the picklist:
In Detail Mode, right-click on your detail and select Options. In Paths/Main Path, right-click on the new object and clear the Excluded option. This makes the added object visible in your detail piece. You can now access this object in seam allowance widths, passmarks, labels, grainlines, Union tool, etc..