This only works for the Light faction. Build up to the command limit. After doing so build a well at one of your bases, because not only do they heal troops but they also replace lost units. Send your units into battle and let men from each battalion die, in order to have your command points go down.

Before returning your men to the well build more battlions of your choice. (You must take down the command points low enough to build more troops). Build back up to the command limit. Once the command limit has been reached send the wounded battalions to the well.

The well will replace the missing troops and therefore build you above the command limit. Usually you can build one or two battalions above the command point limit. You must keep at least one unit alive from a battalion in order to replace the units from the battalion so be careful!