Untrim Surface

(3D only) Used to:

Reverse the sense of trim boundaries in a B-spline surface or SmartSurface — that is, convert holes to surfaces and vice-versa.
Remove one or more trim boundaries (holes) from a B-spline surface or SmartSurface.

Where a trim boundary is shared by two faces, along an edge, no change is made.

You can access this tool from the following:

Setting	Description
Trim Boundary	Sets the task to be performed. Reverse — Reverse the sense of the boundaries. Remove All — Remove all boundaries. Remove One — Remove one boundary.

Key-in: UNTRIM SURFACE