Sync an Item and all of its Subitems across Boards

I am new to and I am not sure if this is the right location for this. What I am trying to do is I have 2 boards, for 2 different employees. However one of their to-do items and subitems is the same. I have setup a template but when I update the templates subitems, like if I add one, I want it to sync to their boards. So say in my template I have Weekly item, then under it I have Subitem 1 and Subitem 2, then I add Subitem 3. I want to push Subitem 3 to the other boards. is this possible? I want to manage things in one place and not remember to add it to everywhere.