Hey!! It's not quite what you want, but there is something similar!
Select all the items you want to move to your existing links folder in the Link menu. Click the Hamburger menu - Utilities - Copy link(s) To... - and then simply navigate to your existing links menu.
It's not perfect as you'll still have to remember which links are which, but for me it's less annoying than constantly re-packaging the document.
Hey!! It's not quite what you want, but there is something similar!
Select all the items you want to move to your existing links folder in the Link menu. Click the Hamburger menu - Utilities - Copy link(s) To... - and then simply navigate to your existing links menu.
It's not perfect as you'll still have to remember which links are which, but for me it's less annoying than constantly re-packaging the document.