It's all automated, you only install the extension and the rest is done by himself.
Current extension version: 1.2.0
The Frequently Bought Together Magento module takes its honored place in aheadWorks’ set of perfectly-crafted Magento sale motivation extensions.
During installation, the Frequently Bought Together extension turns off the Related Products block. By inserting a simple code in your CMS, you can choose where to display the module’s content.
Tanya Poleshchuk | Head of Customer Care
I will be happy to tell you more about this extension!