Happy Monday all (if there is such a thing?)

So, I recently dropped a good bit of money on CC3 and City Designer 3 in order to get a floorplan created for the Manor that my D&D group just purchased in Hardby (Greyhawk). While there are some absolutely fantastic things here that I can draw ideas from, nothing really fits with the vision I've got.

So, back to my problem.

I've been troubleshooting install issues all day and finally got that fixed, but within CC3 and CD3, I don't see a way to start building out a floorplan - or at least not one that I'm smart enough to find. I'm a System Administrator by trade, so I like to think I can pick things up fairly quickly, but I feel like an idiot trying to design this building.

Help?

And apologies if this should go to another forum. Since I was trying to get a building set up, I thought it might go here.