I don't think you are know what I mean, I think there is a break in our translation. But, its OK!
This attachment is what a classified is. It's were you let people sale items.
Ok i see you, but the answer is not. You can't load the classified in forum pages under wpForo menu. Because wpForo is loaded in one page content. wpForo is not a whole CMS, it's a plugin, plugins are loaded in WordPress pages, so you can't load one page in another page. When you click on classified you go to classified page not to forum page, those are different WordPress pages and those cannot be loaded in each others.
Do you custom make addons for customers?
Yes we do, you should contact to gVectors Team via support[at]gvectors.com email address. They'll assess the work and provide with the price.
@robert thank you