I have 3 roosters, a Crested Cream Legbar, Bielefelder and a Light Brahma. What can I cross these Roos with to get autosexing or sex linked chicks?
Cream Legbar and Bielefelder can work two ways, Light Brahma works one way. In all cases, it is inconsistent whether you can actually sex the chicks, because sometimes the differences are more obvious than others.
Cream Legbar and Bielefelder both have barring.
Crossing them to any other hens with barring should give autosexing chicks. Males have two copies of the barring gene, and females have one. So males have more yellow (especially on the top of their heads), lighter leg color, sometimes overall lighter color. Females have smaller head dots or none at all, and typically darker leg or body color.
You could use any hens that are: Cream Legbar, Bielefelder, Barred Rock, Cuckoo Marans, Dominique, Crele colored, and so forth.
Cream Legbar and Bielefelder both have gold.
Crossing them to hens with silver will give sex linked chicks, with males being silver like their mothers and females gold like their father.
Silver hens would include Silver Laced, Silver Spangled, Silver Penciled, Silver Duckwing, Columbian, Light (Brahma/Sussex). No matter what the breed, hens of those colors should work. Some all-white hens also work, but some do not, and there's no way to tell which are which by looking at them.
But sometimes the chicks are still hard to sex, either because both genders are so light colored that you can't tell the gold from the silver, or because both genders have so much black or gray that you can't see the gold or silver areas.
Light Brahma does not have barring.
Crossing him to a hen with barring will give sex linked chicks, with males having barring and females not barred.
This should work fine with any Barred or Cuckoo hen breeds (black with white barring). Sons will have a yellow dot on their heads, and lighter leg color, and daughters will have no head spot and darker legs.
In theory, it would also work with other hens that have barring (like Cream Legbar, Bielefelder, Crele color of any breed.) In practice, you would have silver chicks with some black and the white barring, and you would probably have trouble seeing the difference in the chick down, and it might also be hard to spot the white barring in their feathers as they grow.