You can create an audio montage from your file in the audio editor and rearrange or delete channels from the Montage. Suggest you work with cue markers for example - region markers.
In the Audio Editor, when you open 5 multi files on tabs, create montage from one file, there is an option “add to audio montage” on the other 4 tabs, which can add other audio files (tabs) to the montage. In the Montage, you can name region marker to the name of your multi file and render regions.
In the Audio Editor, it is possible to drag audio from adjacent channels/range to new tab/channels, (for example if you have a 4-channel file, you can select 3, drag to a new tab and create a 3-channel file - copy from one channel and paste to the other), change (add or take away) total number of channels, etc. but Montage workflow would be better.