Controlled (or mapped on indentation level) font resizing

[1001QAdotNET]

When copying and pasting text from other sources I often run into this issue
The headings and the text have disproportionate font sizes in reference to each other.
I would like to be able to select all the text or just a portion of it and say: decrease all the fonts with x points or decrease the fonts for H1-H3 only with X points each or to be presented a list with header sizes and regular font size and to be able to manually enter the font size (and even the font name) that I want to be applied

I hope this is not a duplicate request
I know that we have styles as well but I think those work individually (they need to be applied one by one)
This is more like an adhoc template (font wise) or in flight adjustments (if you pick to decrease all of them for example)