Child / Parent Third Parties

Hello,

I’m looking around for a module that can enable child and parent third party, but I can’t find what I’m looking for :
I would like to be able to assign “Sub Third party” to my Third Parties

For exemple when I’m adding a Third Party Contact to a proposal I would like to see only the “Children Third Parties” or “Sub Third Parties” of the Third Party I’m making a proposal to

I hope it’s clear, thanks for you help !

Faycal