How to bulk products to related products

Hi.

Dont know, if Im posting at the right forum, but im new...

Looking for an extension which makes it easier to bulk a lot of the same products to a lot a simular products. Got many simular products, which I want to relate, but I also want to show products from other categorys. Any one knows a good extension. Cant seem to find one...

Best regards

Peter.

With this extension here you can add bulk related products in your shop.
https://www.opencart.com/index.php?rout ... n_id=28825