I think it goes like this:

Two settlements connected by Settler you assign as a Trader (or whatever they're called) share the base junk components in their benches.

A settlement (A) connected to a settlement © that is connected to another settlement © will share with settlement ©'s bench inventory. (there was arguments that each settlement had to be connected but I've since proven that myself to not be true).

My question is, what about Junk, not the base components? If I have a globe in Settlement (A) and need cork in Settlement ©, will Settlement © be able to use the cork? If so where do the extra components go? In Settlement (A)'s bench inventory? Settlement ©'s?

Any other things worth noting concerning Settlement trading?

EDIT: Well my " ( C ) " became ©. Oh well.