U install a fresh tvh till you get to the point where all services are listed.
Then u select "importchannels" and select a previously exported "importfile".
The "importfile" only contains "channel number" and "channelname".
Then tvh compares "channelname" with the existing services, and if "channelname" has a 100% match found, then it adds it with the "channelnumber" from the "importfile" to "channels".