Gah!

In WE this is easy; you can switch out the units during setup.

In STW, you have to be a little more inventive. The first units to enter play will be the ones stacked with the commander, so figure out which guy will command (the best general). Select the range of units you want with him for the first start.

For the reinforcements, there's no way to control the sequence. Try to send a mix; they enter in sequence by type, cavalry first if Krast remembers correctly, then the infantry guys in some sequence.

Try some experiements with this, and post again if need more help.

Gah!