Dlh, Yes.
You actually do it with the learn function, so you'll set it to learn the key you want to use, then you can tell it to add a delay (optional, I didn't need any delay, there's already a half second to second delay) and then another key, then a delay, then another key, ect. For my setup I have it turn on the TV, Cable and Stereo with the main power button when the remote is in cable mode. Unfortunately, that means I had to record just the Cable's power button as a new button so that I could turn it on/off independently of the rest of the devices but I rarely use that.
