Moldmaking Plaster molds without undercuts in sockets

Hi everyone! :XD

So, I'm nowhere near a plaster mold making stage for a doll, but I'm planning for the future and would like to avoid mistakes as best I can. I've searched the forums and can't seem to find anything about making simple rigid molds around sockets. Forgive me if I'm missing something obvious here or if I'm asking an impossible question, but I cant seem to figure it out for myself.

For example, many lower leg sculpts will have a socket for the knee and a socket for the foot, with the balls themselves being on the knee and foot respectively.
How then would you make a simple 2 piece plaster mold of this doll part, is it even possible? I understand it's not an issue with silicone molds but I have my heart set on eventually casting in porcelain

From what I've seen the seams are usually running ether side of the length of the leg, with a pour hole at the knee socket, but how would you demold, would there not be undercuts into the sockets? Is there a way without venturing into a more complex mold with seperate pieces slotting into the sockets? :dead I really don't fancy that on a tiny scale doll.

I'd really appreciate any advice (pictures would be excellent too) I'm used to using rubber and silicone mold materials, so this is a bit of a learning curve.

 

Thanks Kwm, I guess i'll just have to see when I get there. If I ever do )