Hi and welcome to the community.I woudl say this sounds like something a little more advance that what you will find in the installation guide or for a more complex car install.
To try and help, would be great to get some more info on what you are looking to do or if you have the model number.
You might need the help of a professional car installer since the majority of the cables and connectors supplied with the unit are designed to be wired in to your main console but running of your primary battery etc. Trying to set it up to run through an aux battery may require you to fabricate cables and ensure that your aux battery does not go flat is another consideration.
Regards, Teshi
