"What do you all use to get the remainder of bees out of a cavity once you have the comb out when dong a cut-out. I don't want to use something that's harmful to the bees but need something that will work."

Patience seems to work quite well. Leave the chemicals in the truck. Like deknow mentions leave the cutout at the same location and allow the bees to settle into the new location. We use a vacuum (bee-killer) as a last resort. Don't bee in such a hurry.... try working with the bees and not against them.