How to make Custom RealDrums Styles

UserTrack Custom Drums

RealDrums Templates with Markers Download

Not sure what you mean by combined them, but you can create your own custom drums easily, you can even use the PG RD's.
You can have the blues playing the verse and funk for the chorus just by copying the verse section from the blues real drums track then copy the chorus section from the funk real drums track and combined them to create up a new custom real drum.

The easiest way is the UserTracks Drums, the next is the RealDrum Templates with Midi Markers, these will show in your DAW as Part A, A fill, A Post Fill, Part B, B Fill, B Post Fill etc.. then you just drag your midi or wav loops or section into the track and save.