Oh good to know you're just building off of how much you know me again? Clearly reading and comprehension is not your strong suit, you can nitpick the nomenclature all you want. At the end of the day if you're as good at CAD as you think you are, you would and did, understand what I was talking about. Now you're so butthurt that you're trying to backtrack and point out anything I said wrong.. seems like the majority of you are having a bad day, so maybe cut your losses and quit responding with comments that aren't helpful.
If you really want to nitpick not even your definition is correct, an XREF is not a drawing at all, it is a reference the program uses to link drawing files together, if you're going to try and correct me at least be right.. When someone asks you a question you don't understand do you just give them an answer or do you ask more questions to try and understand? When you don't understand do you just repeat your same answer and say "well its not magic" or do you just say "I don't know", If the question I posed is really that crazy but somehow there are a million out there, then why reply if you don't have a solution? Clearly I take my ability to teach people for granted because the help on this forum is anything but, just a bunch of guys who can't get out of CAD and would rather comment back and forth then actually understand the question and provide a solution.
Not to mention the crux of your entire post, that "you want to change an existing XREF into a demolition XREF" couldn't be further from the truth - you're arguing over something I never said and that you inferred - I asked for the WORKFLOW of adding demolition changes to the base drawing (which is xrefed in this case). If it is as simple and there are as many solutions as you all say, then couldn't you respond with "copy the base file, add demo layer, then xref that" WOW I DID IT IN 10 WORDS!!!! Are you honestly that upset with the world that you are going back and forth with a complete stranger on the internet - if so maybe you should log off and stop contributing or maybe try therapy? You need learn to look outside your little CAD bubble and realize that the vast majority of the world does not operate in it, and there are PLENTY of solutions that exist outside of it.