https://www.backyardchickens.com/t/261208/sex-linked-information
Check out the thread above, it has great information about the different types of sex links. For a black sex link, which is what you'd be doing with a cream Legbar pullet, the mother has to be the barred bird. A female passes barring only to her male offspring, so if she's bred to a non-barred bird, only her male offspring will be barred. A male barred bird passes barring to all his chicks regardless of gender. So, your Legbar cockerel will give you pretty barred birds of different colors, just not sex linked.