Hi @Bricruz, @Davidschenkler shared a great tip for connecting subitems to other subitems. This example shows how to link subitems within the same board, but the same steps work across different boards too - just remember to add the column at the subitem level on the other board as well.
Here’s the link to the solution: Connecting Subitems to Other Subitems – Secret Unlocked! - Platform discussions / Special workflows & use cases - monday Community Forum
Hope this helps!