Draft it Help
We will now copy the new window to the opposite wall. Select Zoom Full Page to zoom out and obtain a view similar to below.
Use a Window Selection Box to select the window just drawn by clicking and holding at P1 and then drag and release at P2. The entity handles are displayed.
Now select the Copy button . Select the 'End' point at P3 as the reference point. Now go Relative to P4 and type '-1500' then followed by '0' and again.
The second window should now be in place. The entity handles are still displayed so click in free space to release them.