Hello,
We are glad to know that you considered using Basel for your web-site. I hope you will be happy with it.
We are sorry, but we didn’t document this element yet. Anyway, it is quite easy to set it up and it has very intuitive settings.
All you need to do is to add an AJAX Products tabs Visual Composer element to your page and then fill it with products tabs. Inside these products elements (tabs) you will see all the necessary options you need. See screenshots
Kind Regards
Xtemos