Geometry Tools - Offset

You can offset a face/shell, a plannar edge/wire, or an edge on the face.

To open Offset:

In the dialog , select the type you want to offset:

a. Raw face
b. Offset face to two directions (Face/Shell)
c. Offset face to Solid (Face/Shell, check "Offset to Solid")
a. Offset using Plannar Edge/Wire
b. Offset using Edge on Face