Successful crossbreeding is a result of patience and consistency in the mating plan. You need to stick to the rotation of breeds and do it systematically in order to achieve the desired results. It will take about ten years to have a real ProCROSS herd.
Within the three breeds you can select bulls that best match your breeding goals. Production of milk, fat & protein, milking speed, udder health, size - all important traits you can select for within the bulls offered to you.
Your distributor has mating services and plans available. Ask for these tools: they help you and your staff to make the correct choices. Do not use too many bulls per breed, three is enough. In this way your herd will become more uniform.