Indesign-Script to change paragraph style for for complete textbox transformations?

Hi! Sorry, if the titel may already be confusing, couldn't summarize it better. :-)))

Here we go: in a newspaper layout I have different texboxes, each containing title, subtitle and copytext. They are 1 to 6 columns wide. And there's a hirarchy: the big stories with much text make the main part of the page, so they get a big title. There may even be infoboxes withouth subtext etc. etc. The big titles have an own title-style (mainly font-size).

No problem: changing the object styles for boxes with the same paragraph styles in it. Changing a hirarchy1-element from 3 to 5 rows: just one click, no problem.

Problem though: changing a 5 column hirarchy1-text into a 5 column hirarchy2-text. I guess because there is no information that tells "my mouseclick": when you change from object-style 1 to object-style 2 you have to take the text containgn paragraph style 1 and convert it into paragraph style 2.

I uploaded an example of what I mean with the different hirarchy levels. To convert from H1 to H3 you would chose different title sizes and you would e.g. have to convert the subtitle into normal copytext. To convert from H2 into an infobox, you would furthermore have to chose a different font family.

The paragraph styles would have to be converted cleanly, because  I need the specific name of the style for a later export into online-text (which is not part of this problem, off course).

Does anybody understand what I mean? Is there a way to store this list of commands, can one do this with a script?