To transfer Layouts.
Open both files (Project A and Project B).
In the one you want to add the Layouts to (Project B), open the Organiser.
On the left, open the top left popup to switch to view your other project (Project A).
Switch to the Layouts view on both side - Layouts of Project A on left, Layouts of Project B on right.
Drag and drop layouts from Left to Right.
(make sure both projects are saved)
All Layouts moved across, will be linking to views from Project A.
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And here's the link to the Attribute Manager help page for Archicad 24 (above links to AC22, as there have been some changes over the last few versions):
https://helpcenter.graphisoft.com/user-guide/127896/
James Badcock
Graphisoft Senior Product Manager