Most of the people (if not all) follow the psak halacha of a specific Gadol HaDor. But many times, there are halachot which are not presented by a certain Galdol haDor but by another Chacham. As for an instant, Halachipedia.org does not follow the rulings of one specific rabbi but collects all of them and gives a ruling.
My question is, if I am a sephardi and I follow Chacham Ovadia, and there is a specific halacha not written by Chacham Ovadia but I find it in Mishna Brura or Shulchan Aruch HaRav or any other Askenazi rabbi, do I follow it or just leave that halacha as there never had been any halacha as such? Or in simple words do I strictly follow one chacham or can I change my posek from time to time?