Google Tag Manager allows you to easily send all products to an external resource, by using the dataLayer, and a specific tag.

But what if you want to fire a tag only when a specific product, or set of products, have been purchased?

I worked out an easy way to get it done, using macro's and dataLayer.

It is now possible to copy rules between categories.

You can either select a source category, or cut and paste rules form one to the other (or even from one server to another)