If you still have some questions about AutoCAD title blocks and XREFS, you can learn more at the videos below:
XREF Reference
https://www.youtube.com/watch?v=OOP5WeDJp-s&list=PLtIYxv3oFXvYrNL99ZzIXXGr7JKkufHSi&index=1
Creating Blocks with Attributes
And if you would like to download the files I used in class, as well as some reference material for color-dependent plot style tables, here is a link to a dropbox folder.
Thank you for this post.