I'm not quite sure what you mean, are you talking about converting your map, from hammer, to a .dif file?
If so, I posted some tutorials on the RTB Wiki about setting up hammer for export to TGE. If not, please be more specific.
Also, spawn points are placed in the maps mission file. If you open base\data\missions, and you'll see a bunch of .mis files. You can open these in any text editor.
If you were to open construct.mis, for example, you'd see the following:
new SimGroup(PlayerDropPoints) {
new SpawnSphere() {
position = "0 0 0";
rotation = "0 0 1 130.062";
scale = "0.940827 1.97505 1";
dataBlock = "SpawnSphereMarker";
canSetIFLs = "0";
radius = "100";
sphereWeight = "1";
indoorWeight = "1";
outdoorWeight = "1";
lockCount = "0";
locked = "false";
homingCount = "0";
};
};