I think Barça C stopped forever. I had the feeling that they wanted to get rid of them and I was right. Unfortunately it was because Barça B were relegated.
I think Barça understand that a feeder club like Gramanet (full control of their
cantera) is a better option. Another thing is that (with all the vultures around the players) the best players don’t want to play in Tercera and especially in the third team.
Barça C would start two divisions below Tercera but I’m not sure, maybe three (every region has a league system afaik). They could buy a place in Tercera although this year, Figueres offered their place in Segunda B to Barça and they rejected the proposal.
Barça B
Olmo has been sold and Jeffren should be there.