Every province can have a rally point with High Command access.

The rally point is where the troops that province produces will travel to. It's a built in movement order so they'll get to the front lines as fast as possible.

Click rally point and click on the target you want the units to go to. When the unit(s) are complete, they will automatically go to the rally point.This feature is helpful if you are going to be away for awhile or you have a large number of provinces that can produce units, that way you won't have to remember what and where they all are being produced. This is very helpful if you use the production queue to produce multiple units from one location.

A Rally Point is where your troops meet up.