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Go to TV Channels and select Digital Terrestrial tab.
This step is also optional, you can simply use automatically created Digital Terrestrial group in your Media Portal front end, but I prefer to create Favourites group that only includes channels I care about. You will need to perform a channel re-scan on your FreeSat tuner to add it back. Warning: If you remove the channel from a group this way, it will also be removed from a global channel list.
If you made a mistake, or want to dissolve the combined channel group for any other reason, go to TV Channels, click on Digital Terrestrial tab, right click on the channel in question, select Edit Channel and remove the DVB-S type of channel from the group. Repeat the process for all channels you are interested in. Media Portal will find similarly looking channels on you other tuners (FreeSat in this case) and display them on the right hand side. Once you are happy that channels are the same, select matching channel on the right hand side and click Combine button. Go to TV Channels > TV Combinations and select your FreeView Tuner (DVB-T). When recording a program from a combined channel, Media Portal will select tuner that has higher priority (setup in Step 2). In my case I use both FreeSat and FreeView so it makes sense to combine the same channels into to one. If you use only one type of tuner, you can skip this step. Configure FreeSat tuner as in the screenshot below. Leave Create "Digital Terrestrial" group checked. Configuration for FreeView is simple - just select your Country and Region. In my case I did this once for FreeView (DVB-T) and once for FreeSat (DVB-S). Your only need to do it once for a single tuner of each type. Click on each active tuner name (below HTPC name) and Scan for channels. If you are not sure which tuner is which, first complete the next step (scanning for channels) then come back and complete priority sorting. In my case, I left following tuners active: Sort all your active TV tuners in priority order using Up and Down buttons. Install Media Portal and Open TV Server Configuration.
Black Gold BGT 3600 TV tuner (UK FreeView + UK FreeSat). Windows 7 64bit HTPC (Intel Core i5, 6GB RAM).