Downloading sims from the sims 4 gallary

not that i know of BUT you can download the household use the merge to bring them into the CAS then where the sims show up in the lower left corner hover the mouse over the one you don't want  should see an X to delete  -delete keep doing that until you have the one sims you want then save that sim to your libiary

edit to add an image

You can click ok the screwdriver on the side and open the family in CAS and then delete sims that you don't want