I'd like to have one parent theme on host for every site on my portal, and each site be a child. I want there to be only one file (or very few files) for the child customization - fonts, colors, special adjustments for very customized items, but that's it. I don't want extra skins - I want the parent/host theme to supply all of that. So when I need to add a class for every site - I just add it to the parent. And each child then sees the new class.

Is that possible in DNN?