I'm using VW 2024 and it currently doesn't have the ability to add Data Tags on referenced files. I'm experimenting with a very similar setup that you have, with a "Primary" VWX main file referencing in VWX files "A" and "B." And I was hoping it would tag the walls, windows, and doors of the referenced files by just using the Data Tag tool in a section/elevation viewport. I've tried both ways of referencing via Reference Settings between "Design layer viewports" and "Layer import" but unfortunately it doesn't behave that way.
Apparently this is because "all objects in referenced layers are deleted and recreated again when updating a reference" (refer to quoted forum post below):
A strange workaround is adding the Data Tags in file "A" and "B" itself by creating a section viewport > editing that viewport and going into "Section In-Place" > then adding the Data Tags there. Although the tag will now show in file "Primary," it would no longer scale because it's tied to files "A" or "B."
