Some issues which I think would be good to address include:
If you are doing a renovation the best way not to include existing in your BOQ is to simply click the existing TAB in the wall tool when you draw it.
You can also do this after by selecting the walls that are existing
You can change your layer names in the layering section of the tool, see demo video
I find it less straightforward to use the numbering system than an alphabetical naming system
We use number as they are associated with job progress. You can change this yet you will have problems with Scenes :scene-gen: . I suggest you get used to using number as it has inherent effect in other areas. I have explained the logic behind the numbering system and also how to change the name of the layers in the YouTube video above.
(I was of the understanding that using underscore is obsolete. )
I am not sure what you are referring to here?
Thanks
I hope the video helps you out Ian. Thanks for asking these are good questions.