To Modify a Cut Interactively

Select the Element Selection tool.
Select an edge of the cut.
The cut is highlighted, and the profile used to create it is displayed with handles.
Click on one of the manipulation handles at the edge of the profile that you want to adjust.
Move the pointer to make the required adjustment (AccuDraw can be used for precision adjustment).
Accept.
(Optional) Repeat steps 3 to 5 for any other required adjustments.
Accept to finish.

Left: Select an edge of the cut (1) and then a handle to modify (2). | Right: Move the handle, using AccuDraw for precise placement.

After modifying the profile, the solid is regenerated to reflect the change.