Create a transparency of non-contiguous fills

I have a single color (black) design I created with draw tools and fills both black and white that create the dimensional look of objects in front of others. When Convert to bitmap I've painstakingly use the magic wand tool to select each non-contiguous white filled area to delete that area so that it is transparent. I'm looking for a way to select-all (white seperate filled objects) at once without having to click on every little bity object to delete them. The end result is for a single line art (black) design on a transparent background for sending digitally to another contract source for production.

THANKS!