Is it possible 2 add a map that i have made into galactic conquest? do i need another lua script? or do i need 2 add something 2 the addme file? or is this not possible? also if i do 4 example-tat4a_h 4 a 3rd lua would that put it in historical campaign?

No, since GC and Campaign maps are defined by shell.lvl, I believe.

oh well

I'm not saying it's completely impossible, since we cracked core.lvl (although there the only thing worth editing is the localizations). and I am sure BF2 scripts might work in BF1. We're just missing a few files.

SWBF2's Galactic Conquest plays completely different, so you can't use that as a source.

I did say some scripts, but BF1's scripts we do not have, so yeah, we can't add to Galactic Conquest.