The Create Overlaps operation analyzes glyph Contours and Hints (if they exist) and tries to detach glyph stems from one another. This feature automatically creates overlaps on vertical and horizontal stem connections in a glyph or across selected glyphs.
The result of this operation is that overlapping open or closed contours can be moved or edited separately:
This operation works both in the Glyph window and for selected cells in the Font window (or the Font Map panel); unlike the Make Overlap operation which only works on selected nodes and contours. When applied in the Glyph window, the Create Overlaps command also selects the stem (or its parts) to allow immediate moving.