Hi mpdg, This is advance code and you need coding skills to add this. this is not supported in core and code will be wiped out once next version will be released. I am working on newer version to make custom sql query posible.
We have detected that you came here from a website that distribute non official sources of our extensions. As we care about all our users, including hackers :) we want to warn you before you do something you will regret.
Is it worth it using nulled extensions? Well we don't think so, it’s a real problem for many reasons: