Unfortunately, there is no carrover between scenarios for troop losses or experience. IT was done in one campaign in the original BA but not in BA2 so far.
i do not know if I mind, I just wanted to know how it is.
in any case it is more realistic that you just get the troops you need more or less. No general will give you less troops just because you did not achieve all the oblectives in your previous mission. it is the progress in the general war that counts.
of course prestige will certainly have had an influence in which field commander got his troops faster or got better units when there where not enough and they had to be distributed. (coruption within the army)
but a simply point system like in Age of Empire which determines your future progress is a bit too simplistic in this regard imho
I don't understand the question. None of the current BA2 campaigns are carryover, but the system is in place for campaigns to be built like that (as per the Market Garden campaign in BA1).