When creating an item based on a catalog item there is a field ("No. Format" in Catalog Item Setup) that defines how the No. for the item is set. The user can choose from in total four options ("Vendor Item No.", "Mfr. + Vendor Item No.", "Vendor Item No. + Mfr." and "Entry No.").

I suggest to add a fifth option "No. Series" which allows to use standard No. series for items based on Inventory Setup.

Being able to do so would help us a lot since our customers want to use the same format for all items independ from what the source of the item was (e.g. Catalog Item or something else).