1. Go to export_descr_units.txt and look up the ingame name of the unit in question.

2. In your game, open console and type in <create_unit "Antigonos Argeades" "hellenistic infantry hysteroi pezhetairoi" 4,3,2,1>

This will create 4 units of Hysteroi Pezhetairoi with experience lvl 3 (3 bronze chevrons), armour upgrade 2 (silver) and weapon upgrade 1 (bronze) for the respective character. Instead the character name, you can / must type the name of the settlement as you see it on screen.