Autodesk 24000-000000-9860 - Revit Architecture - PC User Manual page 881

Split the existing lines and add arcs.
Draw openings or holes.
Wall modified
TIP As you edit the rectangle, datum planes appear to indicate the original shape and size of the
wall. If the lines you sketch snap to the datum planes, the endpoints of the lines automatically align
to the planes, unless you explicitly unlock them. If you unlock the sketched lines, you can modify
them independently of the datum planes. If you exit sketch mode while the sketched lines are still
aligned, then as you move a datum handle, the sketched lines move with it.
Sketch lines unlocked
4 Click Finish Sketch.
Modified wall displayed in 3D
NOTE To revert an edited wall to its original shape, select the wall and click Remove Sketch on the Options Bar.
Modifying Structural Walls | 843