Use this procedure to create a profile that you can use to define the shape of a door/window assembly mullion definition. You can then extrude the profile to create mullions from it.
The height and the width of the polyline you use to create the profile define the default height and width of the door/window assembly mullion. The insertion point of the profile is aligned with the centroid of the mullion.
The insertion point of the profile is aligned with the centroid of the mullion.
You can now use the profile as a door/window assembly mullion.