1.Download a Quake II editor like quark or qped 

2.Load it up and open the pak1.pak in your baseq2 directory 

3.Open the maps folder and right click on the ones you want 

4.Choose EXPORT FILE and save the bsp in you kingpin/main/maps folder 

5.If you don't have that folder, make one. Make sure you export the folder textures and place them in the kp texture directory.