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)

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.