[header] How to sort cows [title] Set up pens and corrals for cattle to be sorted into. [step] You cannot do any sorting without having other corrals to put separated cattle into. If you are wanting to hold them for a length of time, they will need watering facilities and a feeding and bedding area. 
If possible and necessary, access to separate pastures is also necessary to keep the groups from mixing. [substeps] This step will take significant amount of time to plan and do especially if you don't have the facilities set up yet.