You can move your primary bedroom photos in the bedroom 1 section, and photos of kids' twin beds in bedroom 2, and so on. If that's what you're looking for see steps below. If not hopefully can help others.
1. in your host profile, select Menu, Listing
2. in the Listings page, on the left side, under Listing details click Property and rooms
3. Under Property and rooms, to the right of Rooms and spaces, click Edit
4. To remove photos of the twin beds that are, for example, in the Bedroom 1 section, click on that section, then:
a. click on Edit photos in that section
b. unselect the photos you want to remove from that section - they will go to the Unassigned photos - all good
5. Repeat step 4 above to remove photos of your primary bedroom in the other section, for example Bedroom 2 - they too go to the Unassigned photos
6. To add photos of your primary bedroom in the Bedroom 1 section, click that section name and:
a. click Edit photos
b. select the photos of your primary bedroom that are now in the Unassigned photos section
c. click Save
7. Rinse and repeat step 6 to add photos of your kids' twin beds in the section Bedroom 2.
I hope that's what you were in part (sort of) looking for and that it works!