fixture builder and highlight

Hi
i recently used to create my 1st own fixture with the fixture builder.
I was wondering how to get the highlight function to work with new built fixtures.

I just wrote a palette and assigned it to be the highlight palette.
I this the right way? I didn't find highlight levels in the fixture builder....

2nd question:
So it is not possible to edit a currently used build fixture?
Meaning.....

I create a fixture using the fixture builder. After the fixture is build i'm gonna patch it. Now when i see that it's not working properly i have to create a new one and repatch all again?