Relating products in Opencart can be quite a pain, as you have to do it for each product individually.
This extension allows you to easily and quickly relate products to each other.

– Filter for name, model, attributes and category (i.e. you can relate all products of a category to each other with only a couple of clicks.)
– Multiway relate: If you relate product A to products B and C, this option will also relate B and C to each other.
– English and German language files included.
– Using this extension will improve the quality of your catalog.
– Saves you time, money and sanity.

View Live Demo at: http://demo.cartlabs.net/product_relator
Username: relator_demo
Password: demo

Go to: Catalog -> Fast Product Relator

This extension works with Opencart 1.5+
VQMod is required