theres probably a few different ways,,,but you can open your channellist with the channel editor progg,,,then open another downloaded channellist with the channel editor progg.
so you have two windows open at the same time and just copy and paste to your channellist the channels you want to where ever you want them on your own list......
hope this makes sence
you can also entyer them by right click and new,,,,but then you have to check any transponder sight for all info needed.