This involves "borrowing" chords from a parallel mode, usually the parallel minor.
Apply this to a Tritone Sub. Instead of just Db7, use Abm7 — Db7 — C . 7. Pedal Points Reharmonization Techniques
A staple of jazz harmony. Any dominant 7th chord can be replaced by a dominant 7th chord a tritone (six semitones) away. In a G7 to C progression, replace the G7 with Db7 . This involves "borrowing" chords from a parallel mode,