Toilets, Sinks, Showers, Tubs and Disposals - Fix a broken tub drain

I was trying to replace my tub drain and it looked like the screw out kind. Instead of it unscrewing it was a galvanized elbow that I cannot get back on or fix.. HELP!!!!!!

Could you please describe where this piece is in relation to the hole that goes through the bottom of the tub, or otherways of describing if it is well downstream? And what screws into each end?

Could you please describe where this piece is in relation to the hole that goes through the bottom of the tub, or otherways of describing if it is well downstream? And what screws into each end?
It was a solid galvanized elbow that on the tub part where you put plumbers putty had the x bar inside that would normally screw out, and the other end of the elbow goes into a metal line about 1 1/2 inch diameter instead of it unscrewing it broke out from the tub and off from the drain line.

Any reason you cannot rebuild the drain with the plastic drain and overflow kit?, and get back to a joint in the main horizontal 1 1/2 inch galvanized drainline? And if the next joint is too far away, hacksaw or sawzall it out and use a Fernco type coupler. A person at a home center should be able to help you out with this, if need be, - if you bring in a sketch of how your 1 1/2 inch is run under the tub. If you buy extra parts at home centers, you can return what you do not use.

For example, the other day when I was completely rebuilding a 1 1/2 inch drainline in a wall, I bought both PVC females and male couplers, since I did not know at the time what kind of extension was required when I exited each side of the wall, to get to both the kitchen sink and bathroom sink traps, that are back to back to back on each side of the wall.