To project & join walls & retain any openings in the walls you need to follow these steps:
Split each wall somewhere between the start/end of the wall & the first/last opening in the wall (shown in image below) by selecting a wall & going to the Split Wall Tool.
Select the two smaller wall segments (i.e. B & 2 shown in image below), right-click on one of them & select β+ WALLS > + Wall Operations > Project & Join Wallsβ.
Select the origin wall & the new wall (e.g. A & B shown in image below), right-click on one of them & select β+ WALLS > + Wall Operations > Meld Wallsβ. Repeat for the other walls (i.e. 1 & 2 shown in image below).
Welcome Will; what do you do for a job, mate? There is a video on this in the tutorials somewhere. Iβll have to find it. If you are ever watching YouTube tutorials and you canβt find something, feel free to comment on a YouTube video. We screen them and answer them.