<help> how to change the starting army in Napoleon campgain

hi, everybody. I'm a Total war fan from Vietnam. after finish the SP, now I want to have some fun .
I need help to change the starting army in the Napoleon campgain. For example: I want to have grenadier_en_ Cheval in the stack of napoleon at the begining...
Can we do that?
thanks a lot. Please forgive my bad english.

have a look in the modding section for ntw on the forum, you may find something there ,, by the way your english is very good ,, tip top old boy