My ex-T tried to do this with me. I gave it a few sessions, but then called it quits. I don’t believe in the concept. Pretending to have these parts, giving them made up names, and pretending they are talking to each other felt stupid and useless. It felt like it was undermining my intelligence while trying to arbitrarily simplify my complex and nuanced inferiority into easily definable “parts.” I know others enjoy doing this and find it helpful, but it just didn’t fit for me.