- how to connect and mirror Sub Items

Hi all - I have a Central Board for daily/weekly tasks on, which I’ve connected to 3 Client-focused boards. When creating Items all is good (well mostly). The challenge I’m having is with Sub Items. I’d like to be able to create a sub-item in a Client-focused board and have it created in the Central Board. And much like how I can update an item and it updates on the other board, I’d like to do the same with Sub Items.
Is that feasible?
Thanks for any advice/input!