Can I switch from head to chest voice?

I’m making a cover of a song that has a lot of high notes and I don’t want the voicebank singing in head all the time. Can I somehow force it to use chest voice?

It will vary with each voice database, but you should first try experimenting with the Tone Shift and Vocal Mode parameters. Subtle adjustments to the Gender setting might also help, but likely only if used in conjunction with Tone Shift.