Please turn your CAPS LOCK off when you post. All caps is considered shouting, and it's bad manners in a forum.
As separate exports.
Premiere Pro can export a mono track, a stereo track, or a 5.1 track. Those are the only options. To get an eight channel MXF you'd need to export out 4 stereo or 8 mono tracks and mux them with the video outside of Premiere Pro.
Is there any compatible third-party codec to export DVCPRO MXF OP1A with 8 audio tracks? MainConcept do, but with 6 tracks at most (at least in the demo)