Thank you for your advise on this one. I should have thought more clearly and realized that I cannot 'set' 0,0 in paper space. That IS set already. Duh.
I have tried, years ago before I knew better, to have the title block, drawn in model space, to be in a viewport. Not the most efficient way, I found out through personal experience. Paper space won me over immediately. Paper space is my friend. I cannot remember if Release 10, when I first began AutoCAD back in the day, had paper space?? What was that, 1990s era? Yikes.
My goal is to make a template TB that will be positioned at 0,0,0 properly in model space, so that 0,0,0 in model space is 0,0 in paper space when I insert the TB as an xref, right? That is my goal for a 36x24 TB.
Oh, will I need to purge the TB out of the drawing I want to insert the TB into, when I have made changes to the TB and want to re-insert the revised TB? Of course, I have already removed it from the external reference tool palette.
Could it be that my ltscale, msltscale, and psltscale are some number other than 1? But, that just affects annotation, right? I've been at AutoCAD since Release 10, and I am probably stuck in my thinking because I've never been taught this deep AutoCAD 'stuff'. I work the program and draw building plans. The IT guy always came to the rescue. Now, Covid has me figuring things out I never saw myself understanding. Obviously, this is one of them.
I will start fresh, back where I know something, and move forward from there. Hopefully, I will lose old bad AutoCAD habits I probably taught myself.
You guys, thank you, all of you, for coming to my rescue. People like me truly appreciate people like you who know more than we do. You are my new best friends!!
Thank you.