This is something we've wanted for quite some time for a variety of reasons:
Able to more quickly deal with requests to take two or more lists and merge them together for a new module e.g. where course revalidation results in two 15 credit modules becoming one 30 credit module - at the moment we have to pick one list as master, and painstakingly identify additional bookmarks on the other list, saving each individually then adding them in, and often recreating sections.
Ability to select useful sections from other resource lists which are equally as relevant/generic enough and copy those into a list
Opportunity to create 'template' sections which could quickly be copied into a variety of lists e.g. study skills, library, accessibility tools, librarian pre-made sections for each course/subject etc
We do have generic resource lists which we link to in a range of subject lists and elsewhere, but sometimes it would be preferable to just have a section with a handful of links which we can copy into any number of subject lists, negating the need for the student to jump in and out to other lists (if they bother to at all).