Could you change a large amount of PCs in the WoR?

Could you give me a short idea of how to replace the dummies? I'm using FF3usME if that helps.

The only dummy one is Summon I think. You assign it with the Actor data editor but more important you'd need to code the command first. What you want your command to do is up to you but you might need to code a menu if needed, etc. All of this is taken care in bank $C2.