B. Extending a Slab/Roof Slab
Use this procedure to extend a slab or roof slab to a plane defined by another slab, roof slab, or wall. This target object itself does not have to intersect with the extended slab/roof slab, as long as it projects an intersection in the current user coordinate system (UCS).
1) Select the target flat plane
2) Select the first edge to lengthen
3) Select the second edge to lengthen
Can be created from closed polyline.
Each edge has two properties:
1) edge cut orientation (plumb or square)
2)angle (relative to the orientation)