Upgrade Storagedeletion of collection when items in second collection
I have a collection with a large number of items in (approx 23,000). I want to keep a small number of these (x4) and delete the rest. However, I don't want to have to go through them one by one. If I move the ones I want to keep to a new collection and delete the original collection and items. Will the items in the second collection be retained?
You'd have to either first copy and then remove them from the collection to be deleted or actually move them, which you can do by holding a modifier key while dragging them to their target collection see bottom paragrph in this section https://www.zotero.org/support/collections_and_tags#adding_items_to_collections