[Suhiir]

I'll emphasize what shahdi said.

Unless you're essentially rebuilding the OOB (due to changes/corrections - this will require people to download your revised OOB) you're FAR better off just using the editor and changing whatever is needed on Default OOB units.

If you need specific formations for a scenario as shahadi said just create them in a modified alternative OOB (never EVER mess with the Default OOBs) using currently empty formations (as said it's best to put them in one place starting at 8-900 so you can find them easily). You can then buy those formations for your scenario, and it makes no difference what-so-ever to players as formations are only used when purchasing stuff (as a player or the AI) for a battle/scenario/campaign.

Keep in mind that weapons data and ammo loads (particularly for small arms) are in most cases "standardized" throughout the game so real world data may well differ. For instance; most 7.62mm "battle" rifles have a range of 10, any "assault" rifle (5.56mm for instance) has a range of 8.