Several solutions are possible.
You import a dimmer and scroller attribute fixture with a DMX break to enter two DMX addresses.
Several gel strings can be stored in the fixture.
You can import separate fixtures with different gel strings.
You can patch a grouping fixture and set a separate dimmer and scroller fixture below it.
I think the grouping fixture is the best walgreenslistens solution.
Thanks for the update and quick reply. I'll be sure to keep an eye on this thread. Looking for the same question.