day1 is intended to be the very first config you put on a device so you have a good baseline of preconfigured security profiles and security settings.
a good way to integrate it into panorama would be to import it and set it as a shared template / shared device group objects so it can permeate into your other firewalls
your use case will be somewhat difficult as you already have a config in panorama which will overwrite or ignore the (local) day1 config. if you want to use day1, it is best to also import that into panorama and merge both configurations
Tom Piens
PANgurus - Strata specialist; config reviews, policy optimization
