How do you delete created volumes?
 

I'm somewhat new to CFD. I originally got my analysis solved and decided to run another scenario, and when I went to build the surfaces and fill the voids, I accidentally created extra volumes. How would you delete these unnecessary volumes that were created? I've attempted to hit remove multiple times with no result. I even deleted the scenario only to find my original scenario had also changed. I can't run the simulation because these extra unassigned volumes need to be assigned, even though they are unnecessary. If I could just delete the extra volumes, I could rebuild the surfaces and fill the voids again.

I am not totally clear on your question.. but in the future, clone your "Design" and make mesh and surfaces mods in a new Design... "Scenarios" are for when you want to change boundary conditions like pressures, velocities etc...

There is command in Tool name fill use to fill inside volume by creating inlet and outlet surface .
After generating inside volume.in model tab delete extra model which are not required.. then run it is useful.