hikamarket vendor select save in session

hi,
I have a site hikashop and hikamarket and My map location(joomunited)
when user go my site, first select vendor(hikamarket) on maps(use My maps location extension) then in vendor page can buy products only this vendor.
but have a problem.
I want when user select vendor , vendor id save session , then when user click each hikashop category , show products only for this vendor.
how do it? is it possibile?
please help me.so thanks

Hikashop 4.0.0
Hikamarket multi vendor 2.0.1

I use this code for save vendor id (in my maps location) in session.

$sessionids = $item->extra_id;
$session = JFactory::getSession();
$session->set('yool',$sessionids);
$yool = $session->get('yool');

Thanks for your guide
But I just asked you guidance to do my own.
In the end, if you do not help me, I will thank you again.