Several books in one project/binder
I started writing on Google docs, but switched to Scrivener halfway through the second novel of a trilogy. In Google I had every chapter (5 per book) as a separate document. At first I moved all 8 finished chapters to one project, and then separated them into different projects when I started on the third one. However, all my notes, character and location sheets, and especially the timeline are, of course, relevant for all three books, so I combined them again and now have one big project with 15 chapters all on the same level.
How do you you deal with such multi volume stories? All in one or separate projects each? How do you organise your writing in these cases?