yeah, the way you worded your question is a little confusing, but let me break it down fo ya...
if your drums are coming from samples that you're loading/sampling into your MPC, when you record them to a sequence, those tracks should be set to DRUM.
When it comes time for you to play some keys and sequence those, then set whatever unused track you're sequencing to to MIDI, and then pick your channel (up to 16 channels if it's one multitimbral keyboard). ex) So say you want to lay down a flute on track 7. Set the track to MIDI, channel 1A (if you're going out MIDI port A). Set your flute sound on your keyboard to transmit on MIDI channel 1. Record and play the flute. Then say you want a piano on track 8. Go to track 8 on the MPC, choose MIDI, and choose channel 2A. Then on your keyboard, transmit the piano on MIDI channel 2. keep going in this manner until you got your sounds (up to 16 if it's multitimbral-- meaning that your one keyboard acts like 16 different keyboards = it can play up to 16 different sounds at one time).