I was up potting some rooted and growing fig trees and I acidentaly knocked one over and the main growth branch broke about halfway through close to the base of the cutting. I am not sure what to do if anything for this. i kind of proped the branch up and back together. i don't know if that would heal. Is there anything else I should do?

Tape it up and seal it as you would to with a graft, keep it out of the sun. It is important your cambium layers are touching. It should continue growing if done properly. If nothing else, it should send out new growth below the break.

This happened last night and now im at work would it be to late to do this tonight?

As with a graft, the broken wood won't grow back together, but over time, as the stem gets thicker through the accumulation of additional layers of newly-formed wood (i.e., "tree rings"), the broken part will be buried inside the trunk and the original break won't matter. It will still be okay even with a delay of a day or so, but you'll need to take care of it as Jason described, and bring the separated cambium layers back together, which is where the re-connecting will occur. The tree will be structurally weak and vulnerable to re-breaking at this point for quite a while--till enough new wood has grown to make up for what is broken. Given how vigorously figs grow, it might make more sense to just snip off the broken piece and let your little tree grow a new stem.

The downside to cutting it below the break is that the tree will probably send out multiple shoots and do what most trees do when they die back to the ground in winter:  it will grow up in bush form.

Granted, you could airlayer a branch later if you needed it to be in tree form again, but ... it's just a word of caution.

I have a JH Adriatic that is about 1.5 years old.

The trunk, about 2.5 inches above soil line, looked like it was blackening and starting to die. I'm air-layering the top to transplant.

Once that's done and cut off, the base should send up and off new shoots and I'll have another plant.

Its maybe 6 months old. I dont want to get to crazy over it i have a lot o other cuttings going, but I want to learn what to do.

I have heard that 'one' way to propagate figs, is to purposely 'half-break'

It's really just a matter of personal preference; there's no "right" way to deal with it. If it were my tree, I'd almost certainly just prune off the broken part. Young, healthy fig trees are very resilient.

Agree with what Ken said.

Thanks guys, I don't have a problem with it being a bush. As long as there are figs on it. It does have another smaller branch now anyway. I don't know if this is a sign or anything, but the leaves still looked ok on it today after being out in the heat all day. Maybe it is ok? I was expecting for it to be a shriveled mess when I got home.