Subfroms /sections with individual actions

I am structuring my complex form using sections and I would like to do separate updates, section by section. However, I observed that an action attached to a section from the main from triggers the entire from submit. Is there any strategy or any recommended way to have multiple forms/subfroms in the same page? For example: I have a section Profile Info, and another Profile Media. I would like to have them on the same page, but each section with it's own action and independed calls to the db.