If you want it to load all the time set it as Default Synth, so in the vst window choose the Default Synth track and load MT Power Drummer.
Of course if you use other midi tracks you will have to change them but this will give you MT Drummer on boot.

Once you have made the drum track section you can drag it out to a folder then > File > Import > Import Melody/Soloist from MIDI.
In the import dialog import the section of Midi to the bar you want it to start at, them import the next section.
The midi drum track can be copied or moved from the Mel/Sol track to the Drum track in the Piano Roll, you can copy & paste section to duplicate them.
Or you can use RealBand to drag out of MT Drummer straight to the track then import back to Biab.

Biab Track Injector for Reaper
Free Biab Chord Picker Tool