Trouble with Rig/ Slots in Sims 4 Studio

It seems like I can't add slots(for chairs) to my table in S4S. If I change a slot I don't have any problems (exept chairs not going towards the table), but when I add a slot *example_name: _ctnm_chr_12 - parent: b__subroot__12 - parent: transformBone(like all the other slots end up with)* it still doesn't work.

What am I doing wrong? Does anyone know how to make more slots for chairs? 

Please help me