Hello SPOOK1138 and welcome to these forums. You'll find many helpful people here and a lot of useful information.
OK, so you imported a multi-track MIDI file (with the MIDI on each track on the same MIDI channel)? And you chose the Reaper option to put each track in the file on a different Reaper track?
I've not seen that before, as the notes are usually on different channels.
After editing, if you just want to save the 9 tracks in Reaper into a single multi-track MIDI file, then you can use "Export project MIDI" on the [File] menu:
Or, if you want to change the MIDI channel of the notes of each MIDI clip, then open the clip in the MIDI Editor (double-click the clip), select everything (Ctrl+a), right-click any note and select Note channel >> then the desired channel.
After you have done all of the MIDI clips you can Export them, as above.