I offer free installation for this extension
Users can add separate products in your store. They can edit , copy , view , delete only their products
I use term vendor for this users.
Vendor have separate admin space.
On front end they have page with his products and information ( address , email, logo , name, description , phone)
Demo http://demo.plusmotiv.com/merchant/admin username/password admin/admin
( use different browser for admin and vendor because they use same security settings)
See product from orders here Sale->Order Product
You can create vendors from admin or they can register from frontend
Add vendors in Sale->vendor
There is enable status for vendor and Product status.
If product status is disabled all products that this vendor add will be disabled.
Vendor can be added from front end in http://yoursitename/index.php?route=vendor/vendor
Vendor can log in http://yoursitename/vendor with his email and password ( if he is enabled)
Vendor can view only orders with his products in Sale -> order
He can change order status( history ).
Note that he will see totals from orders including other products prices.
If you want to separate orders only by his products you can do that in Sale -> order product .
Here he can see only his products from orders and change status only for product( not full order)
In extension/module there is Vendor module . Install , Enable and set where you want to show on frontend.
It shows list of vendors (with status enable) at front end (same as category).
On click it will take you to vendor page with his products and informations(name, logo , description , address , telephone, email)
Vendor can see/edit/add his returns in Sale->returns ( but only if model and order_id are correct)
Vendor can see/edit/add his reviews in Catalog->Reviews
Vendor can change his profile( email , password ,description , address ...)
Total sales price at dashboard , statistic for orders,tax,shipping are for full order including products that arent on that vendor.
Admin can filter products and orders by vendor.
Separate folder for each vendor ( for images ).
Seo url for vendor page.
If you set up Product status for that vendor to be disabled , all products that he will enter will be disabled and only admin can enable them.
Vendor admin http://demo.plusmotiv.com/merchant/vendor username/password firstname.lastname@example.org/7777
If this not work create your vendor and login with that or change username / password in admin->sale-> vendors
For separate shipping for each vendor check this extension https://www.opencart.com/index.php?route=marketplace/extension/info&extension_id=31667