In your specific case, I think it would be more advisable to create the "existing" part in a model and link it to the model where the new part will be modeled.
But FOR ME, duplicating numbering of singular elements is never a good option, and I'm not just talking about Revit or BIM, I wouldn't even do it drawing on paper. It can cause problems identifying areas, columns, coordinating between disciplines, etc.
I'm already imagining the email from the MEP people: "We have to move the downpipe next to Grid 4..." and you like, "But there aren't any downpipes there! what are tou talking about!" 🤣
I won't say that happened to me... I won't say it 😐
In the project that happened, we ended up renumbering the existing grids with a "0." in front, so that 0.1, 0.2, 0.A, 0.B were the old ones, and 1, 2, 3, A, B, C were the new ones.
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