you go to tools, half life, decompile normal half life model, pick what model u wanna work on, let it decompile, go to file, then import half life smd, then pick the reference smd, it could be named alot of things, so just look around, then when ur done go to file, export smd, then save it, then go to tools, compile qc file, then click the one in the model folder, and then ur done