About multishop module

[AlexCissar]

Now, I'm making EC-Site by using prestashop.( newdev.yegm.jp)

But, I have one problem.
I want to make multishop sites.
I mean, 
- there is one url for customers.( for instance newdev.yegm.jp)
- but there are 3 shops and they shops can register product individually.
- shopA can't see shopB or ShopC's products in admin page.
Every shop can only register its product and manage in Admin page.
- Customer can shopping from one url(newdev.yegm.jp).
the products of shopA, shopB, shopC are all listed in newdev.yegm.jp

But by using the multistore of prestashop function, I can't accomplish above task.
Because the multistore function of prestashop makes every shop different url.
for instance,
http://newdev.yegm.jp : main shop
http://newdev.yegm.jp/mulitestshop : other shop.

if the manager for multestshop register product in admin page, that product is not displayed newdev.yegm.jp.
That product is only displayed in newdev.yegm.jp/mulitestshop.
This is not that i want.
So how can I solve this?
Please help me.