In a beating line you will have 2 flanks, which are the sides, and a back line, when the flanks are in place the back will close in, and as the back links up with the flanks, everyone closes in slowly, stopping as birds get up, and this is what puts them over the guns, general in a pheasant drive is where you feed the birds, you will have a feed ride on the middle of a crop or wood depends on your drive, and whistle them back to feed them, if
They're hopper fed the hoppers will be in a drive. This is a rough idea mate hope this is a help!