You can setup a smartphone, a computer or a phone connected to an ATA as an extension. You would use the OBion app or a SIP softphone. If you use SIP, the softphone must be able to call without registration.
I'm not familiar with the 1022, but on the 1032 to transfer a call you would use a Program key or the Transfer key. The program key would connect to the extension. With the Transfer key you would have to dial something. After the extension answers, you press Transfer Now and hangup.