Press B on your keyboard or select Break Wall on the Sketch toolbar.
Click the east wall of the Bedroom, 7’7” (interior dimension) below the north wall.
While holding down the Ctrl key, click and drag the north section of the east wall to create a new room.
Drag the east wall of the new room until the dimension shows 5’1” (interior dimension).
Right-click the new room and select Properties.
Name the room Closet.
Under General, click Subgroup of and select Bedroom to define the closet as a subgroup of the room.
Click anywhere in the Sketch workspace to close the Properties window and save your changes.
If you don’t press the Ctrl key, you won’t create a new room. Instead, the Bedroom will expand. If this happens, press Ctrl-Z or click Cancel, then try again.