UPDATED FOR OPENCART 3x
Ever wanted to sell products to specific Customer Groups? Stop searching. This is the extension you need. Sell for example some products to only wholesale or to VIP's or whatever reason/Customer Group you can think of.

VQmod is needed for this extension

INSTALLATION
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1. look in the folder with the same version name of the Opencart version you are using on your website.
2. Inside this folder you see a folder named "upload" --> copy everything inside to your server. So copy the folder "vqmod" to the root of your server. NO FILES WILL BE OVERWRITTEN!
3. Login to your admin and go to CATALOG --> PRODUCTS --> a database record will be added to make this extension to work.
4. When done go to SYSTEM --> SETTINGS --> EDIT (Your Store) --> TAB OPTION
5. Set the Default Customer Groups and set the rest of the options according to your needs. If you want to update all your (existing) products with the Default Customer Groups (otherwise no products will be shown on your website) make sure to set the option "Update All Products" to "Yes". This is a one time action and if everything went correct make sure to set this option to "no" to reduce the database queries.
6. You're finished!!! Go to CATALOG --> PRODUCTS --> and see the Customer Groups assigned to each product in your product list (if you have selected it to show in the settings) . You can modify the Customer Groups, on the fly, by clicking on the shown Customer Groups in the list for a specific product. The checkboxes will appear and clicking on a Customer Group checkbox will instantly update the database. Click on the "close" button to hide the checkboxes!

Note: Until you finish step 6 there will be a short time where no products will be shown in your shop. Once done, and selecting at least the Default Customer Group equal to Setting->Your Store->Tab Options->Sub->Account->Customer Group all your products will be available to everyone who visits your webshop!

10-05-2017 This extension is now updated with a bulk update function for easier editing!

This extension is part of "The Ultimate Customer Group Control" extension. Buy this extension and save lots of $$$$$. Get "the Ultimate Customer Group Control" extension here