On the font size of paragraph style of character style you can enter you percentage:
Thank you, but I should have been more clear.
I want these to be set up so that redefining the H1 text size will automatically cascade and redefine all of the other text sizes.
I have a work around using the Hor/Ver Scale percentages, but I would like to find a more efficient way to do it.
It's been a feature request but that feature is not available.
The H/V Scale is exactly the way to do it. I find it very efficient.