Tvheadend

I have a manually created IPTV network that I have used to create muxes that will (using a pipe:// URL and ffmpeg) let me watch certain online streams. I would like to create a second IPTV network and move some of the muxes to that, but I can't find any way to change the network associated with a mux. Is that possible, and if so, how do I do it? Would rather not have to recreate the muxes manually if there is an easier way, and then recreate the associated channels, etc.