Bukkit

I am trying to add donator ranks in with my prison server. Now to do this I have my rankup setup going from A-Z with the normal ranks. Now when someone donates it adds a sub rank (Groupmanager /manuaddsub <rank>) Now when someone has a sub rank, the next time they rank up, the next rank then becomes a sub rank too… Therefore they have the wrong rank tag and their main rank is the rank before they /rankup. Now I tried making it so that it overrides the ranks however this removes peoples donator ranks? So how do I make it so I can give someone a donator rank but they cans till progress through the main ranks of the prisons server? Thanks!

I would like this as well