Since I have a pretty generic constants setting I use in all my maps, how do you export and import that data so you don't have to go through the same tedious crap every time.
If you open your map with an MPQ editor then you'll see a file with a wierd and rather long name. Open it with a simple text editor and see what is in it. If it looks like your custom gameplay constants then try exporting that file then importing it into another map.