First you need to find out which IR signals are being used and then you can convert them to Pronto Hex.

That's something of a problem with Panasonic Combo systems- the IR signals vary from model to model.  However, you can try signals from various models and probably find all the functions.  See this file for the SA-CH60 (you'll need to download RemoteMaster also to read the file).   This Excel spreadsheet also lists possible device.subdevice and function (OBC) numbers for various Panasonic equipment.