This modification allow you to add mass special for group of products. You can choose group products by manufacturer, category, several single products or combinations from these three.

How to install:

• Copy the archive contents in your root directory;
  
• Then go to Modules section on your admin panel;
  
• There you can find "Mass Product Special" module.

In edit mode of the module you can choose your criteria and then just save.

For any bugs you can write!