I've watched some videos about PCT style, but this is different.
Tie a 1 ft piece of webbing on the end of your cord. A small carabiner on the end of that webbing. Attach your rock sack as normal. Throw it up and over a limb as normal. Unhook the rock sack. But instead of attaching the food bag to the carabiner, hook the middle of your cord into the carabiner. This makes a big loop of cord with the end hanging to the ground. Pull on the cord to get end with the carabiner to the top of the limb. Now you've got a big loop up and over the limb with no weight cutting into the limb. A pulley of sorts at the limb and one at the ground to hook the food bag to. The food bad with it's carabiner hooks into the bottom of the cord loop. Now pull the end of the cord to get the food bag up to the limb. Tie in a stop stick. Release cord. Now you've done a hang without the cord cutting into the limb with weight on it. You do need 50% more cord.
Does this make sense?