Create new item in another board and include sub items

Hi All,

I’m hoping someone can help me?

My issue is that I have 1x board that I use for managing projects, this includes costs and creates our resource calendar based by pulling information from the subitem tasks. This works perfectly for internal resourcing, the issue I now have is I use external resource that cannot see costs. I’ve tried hiding these columns and works but don’t really want our external teams to see the other projects and risk them accidentally editing something they shouldn’t.

I am trying to create a new idem in another board and this works but doesn’t seem to create the subitems so they can view their resource. Is this possible or is there another suggestion so they can view work assigned to them?