Two stores (domain&subdomain) individual login?

Hi there,
i have searched for answer for two days and i didnt find it, so im asking it here?

I have two live sites in one OC instalation DOMAIN: http://www.svecedisece.si and the second store on SUBDOMAIN: http://b2b.svecedisece.si/.

The first one is for default (retail) buyer and the second one is for wholesale with diferent pricing and quantity and sign in approve option.

Problem is that if you register as default on the retail- first site you can login with the same data also as wholesale on the wholesale site.

I want separate logine for retail site with no cross login with wholesale site on subdomain.

Is this posible or is this standard OC configuration or am i missing something in setup.

Please help...site is already live so i need the solution badly.

Can someone can just explain me normal opencart login sistem in this case domain-subdomain. Can you just direct me to maybe already ansverd question. Maybe ther is some modul?

Thank you

Never got that to work.
ended up installing 2 versions of oc each one with their own database.
In the end it is far more easy to maintain customers and prices of products in both stores.

Yes i realized it now...
but it is strange so many words and mods and blablabla about connecting different stores and cart between them but one simple and very needed function in OC domain-subdomain relationship is not possible to achieve.