Well I was right and wrong. You wont get black sex links, but I was wrong and you will get sex able chicks with barred rocks and cream leg bars.Not 100% sure as I have never crossed these to anything but I did hear of someone crossing them to barred rocks and coming up with autosexers! Ill have to find the article... I dont plan on doing it but others do
Well off my phone and on computer and man there are a lot of stuff you can mix them with for auto sexing. It's hard to narrow it all down to a list each site says a different breed(s). Most don't list what to look for when mixing them to tell them apart. But I did find one spot that says if you do the leg bar x barred rock you would look at head dot like you would with normal barred rocks. From what I read auto sexing x auto sexing = auto sexing off spring. weather that off spring breeds true to anything I don't know. one person wrote of crossing them with light Sussex to make sex links using gold from cream leg bar and the silver from light Sussex. So you can use them with auto sexing barred breeds to tell off spring genders or you can mix with silver gene hens to make sex links. Ether way lots of options it seems. You just have to know what to look for in each chick.
I think you could spend days looking this stuff up and not have it pinned down to what all you can do with them.
If you realy want to know about the CCLB check out this thread.
https://www.backyardchickens.com/t/713115/cream-legbar-working-group-standard-of-perfection
I have read about half of it from the begining. Some good stuff there.Be warned though they get a bit technical there.
Ty you slowing picking through it seems first part is trying to get the standard set up for them.