Changing Dependents on HubSpot Design Manager

I am building automated emails and I want to change the footer information .html. I am not sure how to change the footer information .html to another .html that has slightly different information. I apologize if this is hard to understand.
Here’s another way to say what I am having trouble with. I see that one .html file has a few dependents that are incorrect. How can I move certain dependents to other .html files?