We want to give our entire music library to one new radio that will use also the mAirlist.
All our library is on .FLAC files and and files author and song names (ID3 tag) was changed or edited.
mAirlist doesnt write that info info .FLAC file so if I copy all folder and import them into new mAirlist installation, they wont look the sam.
How can I do it then?
If this is a complete separate station that should have its own hard drives with music files, including a complete independent database:
Select the files to be exported → Right-click and choose Mass Editing → Choose “Export: MMD”
mAirlist will save the .mmd files (that stores all the settings of a music file) in the location of the music files so you can give the full folders to the other station.
In the new database then import the music files as usual. Deactivate the Auto-Cue function as mAirlist should import the attached mmd files too and write the settings into the database entry for every file.
If the mmd-files were exported later after the music files have been imported into the new database just put the mmd-files in their respective folders,
select the files you want to import the metadata for → Right-click and choose Mass Editing → Choose “Import: MMD”
mAirlist now overwrites the database entries with everything that’s in the mmd file.
If this is a station that could share your network files and your database entries you can set up another “station” within the Database settings.
In a multi-station mAirListDB, all stations share the following data:
Audio library and storages
Available hour/music templates
The following data/settings are managed separately for each station:
Hour/music template assignment
Advertising settings
Playlist
Read more here:
https://wiki.mairlist.com/tutorials:mairlistdb:multi-station
Side note: When an MMD file is present, mAirList will never do Auto Cue, read file tags, normalize, etc. - because everything is already in the MMD file. So it doesn’t make it a difference if you tick the box or not.
Well thought-out as always but not obvious 
Did it work for you?