Draft on reference face:

The draft on reference face allows you to extend the draft of the reference face to the selected face : the reference face geaometry replace the one of the selected face.

a - Apply a draft on the face 2.

 

b - Select the red edge as reference edge.

Here is the result you get after the drafting.

Now, if you apply a draft to the face 3 with the face 2 as reference face, youget the following result:

The face 3 lost its cylindrical geometry and become a conical face as the reference face.

CAD Topsolid On Line Help Index
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