how to make multi-faction units?

[desean]

How to make a certain unit, lets say the beornings, recruitable by various factions?
And if it isnt much to ask, how to make it recruitable in a single of certain zones (i think it is with the hidden resources but i dont know how to implement em)

Sorry you guys must already get alot of questions like this, but im planing in making units more local and not so much faction based
Ty in advance

[JuL14n]

For those who are new to modding of Medieval 2 total war, tutorials can be found here.
http://www.twcenter.net/wiki/M2TW_Modding_Tutorials

And this may help for adding units to other factions.
http://www.twcenter.net/forums/showthread.php?t=74945

edit2: Now.

[desean]

Thank you