One way to do it is:
Aux out to-->reverb in, reverb out-->to line in on mixer channel. just don't turn up the auxes on the channel your sending the reverb through.Another way is using the mixer inserts taping off the send/return to go to the reverb in then reverb out to another channel.
The only advantage to doing this is, you can fine tune the mix by mixing the dry channel and reverb channels seperately.