Can I just move one wallet.dat to, say, wallet1.dat, then create another wallet? How do I transfer funds between the two wallets if I have only one computer? I know with multiple computers it is easier. But with one, do you know note down the inactive address, and send to it, and swap the wallet file name and  reload qt?

Sorry if it is a too simple question, but I tested with small amount FTC, and the amount I sent to inactive one I can not see it anymore, even I swapped the wallet file names and reload the qt.