Import and Update PDF Export Preset

Hey there again!

I'm now trying to define a preset for the PDF Export process... it's based on the "High Quality Print" (from the Adobe PDF Preset list), and then I want to change "one or two" parameters.

Changing one or two parameters is easy, I've been doing that already, but since most of them are already defined by the "High Quality Print" Preset, my idea was:

1. Load the "High Quality Preset"
2. And after that change the required parameters
3. And then export to PDF of course!

How can this be done?

Many thanks!!

Best regards.