Thank you that really helps. What do you feed your meat birds? Keep them separate?
I have one flock, they all eat the same and are kept together. Others do it differently. I almost always have immature birds in the flock, to keep meat in my freezer and avoid buying another freezer I raise several different batches each year. Some I hatch in an incubator and brood them myself and some are raised by broody hens. Since I have immature birds I never feed Layer because the extra calcium in Layer can harm growing chicks. So I feed them all a high-protein Starter when I have baby chicks and switch to a Grower when they get a little older. I offer oyster shell on the side for the ones that need the extra calcium for egg shells. They tend to know which ones they are. Mine have forage available and they get kitchen scraps and excess or rejected stuff form my garden.
Mine are all raised with the flock. I butcher my cockerels between 16 and 23 weeks of age, that suit show I raise and cook them. Most years my cockerels stay with the flock until I butcher them but maybe once every three or four years they get so rambunctious during adolescence that I isolate them from the flock. I go by what I see and don't have any set rules I have to live by. They still eat whatever the rest are eating but no oyster shell.
I also eat my pullets. If you are hatching chickens to eat many will be girls. You will soon be overrun with girls if you don't do something. Some people sell the excess girls to help pay for feed. My personal preference is to eat them. There are only two of us and I can get two meals out of a small pullet. I Keep my own replacements, keeping a few every year and eat the older hens. By 8 month of age I've been able to evaluate each pullet for egg laying so I can decide which ones I want to keep.
I currently have 10 red sex links and I've got 10 columbian rock x coming later
There are two different kinds of sex links. One type are made from the commercial egg laying hybrids and are great at laying but not so good for meat, their bodies are pretty small. The other type are made by crossing two dual purpose birds and will be like dual purpose birds. I you can tell us what they were called and what hatchery they came from we may be able to tell you which you have. Those may be suitable as breeding stock for what you want.
Columbian Rocks are good dual purpose birds, they may suit you very well. You may get an accidental cockerel with them, that often happens. If you want to make sure of a cockerel for breeding and your facilities can handle the number you might call the hatchery and see if you can increase your order to add 5 to 10 cockerels. Since most people want girls they typically have a lot of cockerels left over. That way you can eat all but one and have several to choose from so you get the best to breed with.