Campaign Editor...unites map settings?

I was looking over the campaign editor....it looks like it may be possible to unite all the custom units into it so I can keep them consistant and change things easily without exporting/importing, and keep from having to re-import everything on multiple maps...basicly, i've never used this part before...what can it do?

if noone wants to tell me here, is there some sort of GOOD tutorial etc explaining it?

I might be able to help you man. Just give me some info about it and e-mail me at [email protected] and I'll try my hardest to help you with a tutorial/Campaign.