I touch on this here as well Redman.

If all of your IR code buttons are stored under one device then you are only going to be able to route your IR codes to one of the extenders IR ports. As such, you'll need to at the very least create 3 addition IR code devices, each set to a different extender IR port. From there simply click and drag each of your IR code pages to the proper IR code device based on what IR port you want said codes to use. And by the way, dragging a page from one device to another will not cause you to lose the links made to the buttons on said page. Dragging buttons from one page to another will also not cause you to lose your links, even in cases where you are dragging a given button from one page in one device to a page in a completely different device.