Click CE in the Merge Walls window.
Select the Merge from location from the drop-down menu.
Click Apply and the prompt
Identify walls to be included in merge displays in the bottom left hand corner of the screen.
If ESC is pressed before at least one wall to merge has been picked, an error message displays.
If ESC is pressed before the key wall is picked an error message displays.
Click Cancel to discard any information and close the
Merge Walls window.