@Red Rocket is correct. The unit itself doesn't allow. And my 2006's stereo setup is like his. I needed a chimes module and a steering wheel control module so 2 separate setups as well. Not sure on the brands of those as it's been a while. There are many threads on here in that topic that I've seen. @dak244 , crutchfield sells the Pioneer with the Pac already bundled with it.
Gotcha, makes sense. Thanks for clarifying!