Thank you for that @Simon!
That's the feature I'm MOSTLY looking for, but I'd like to be able to do it with wishlists, or a custom version of a MOC that I have modified.
For example - I'd really like to build this MOC
However, the creator of this MOC never updated the partlist on Rebrickable. It also has an error because it counts parts in the set that are not part of the ship.
He did give people the LDD file, which I have been playing around with. I removed a bunch of extra parts of the build (the moon bases), and I modified some mistakes in the LDD which had colors that were very expensive/rare or he simply made a mistake. I did that by exporting the parts list to Bricklink, then manually pricing each part based on the most common piece available.
So now I have a Wishlist in Bricklink that has ONLY the correct parts I need for this build. What I want to do is get that custom wishlist BACK into Rebrickable, THEN sort by the sets using the feature you listed.
Is this possible?