Split and Joint Patches
You can split and joint patches simply by clicking the edges in the 3D view or the 2D view with the Joint Tool. You can also split multiple edges by dragging from an empty area in the 2D view to make a selection box. All edges touched by the box will be split.
If the Explode after Splitting option in the Inspector is checked, the split two patches will move a short distance in the opposite direction. Otherwise, they will stay in place.Rotate Patches Reshape Flaps