i want to make a split grip rod and was wandering if you could make a full grip into a split grip because i feel it helps balance the rod more

Yes, it can be done, but the challenge is to remove the epoxy.  Not sure why you would think it would balance a rod, unless the rod is butt heavy.  ;D  Anyway, the weight reduction is probably measureable but not much.

i want to make a split grip rod and was wandering if you could make a full grip into a split grip because i feel it helps balance the rod more

removing weight from behind the reel seat, no matter how little, negatively affects balance.

but yes, you can split the grip.  There was a tutorial posted a while back by "justtrying" you might find it with a search.

check out rod building tutorials.com under grips and seats. I've done it and it not that easy.