Never mind it works now
the method:
in mp3tag:
create new action:
Action type: Format value
Field: track_Decade
Format string: %comment:Songs-DB_Custom1%
Action type: Format value
Field: Occasion
Format string: %comment:Songs-DB_Occasion%
Action type: Format value
Field: Others_tags
Format string: %comment:Songs-DB_Custom4%
then run this action
after that create a field in MC whith the same names as above (occasion,track_decade, others_tags,...)
let MC update library from tags
et voila!