Hello, before using this module AlsoBought, I was using another but finctionnait wrong with my template. 

I installed it, and of course lost all the history of the old module. 

Is there a way to recover sales to supply the module and not have empty? 

thank you for your help.

AlsoBought does not provide functionality which allows you to manually add information about usually purchased-together products. The module works with a default OpenCart sales functionality and interpret it via its own logic in order to provide accurate information about product pairs which are usually bought together.

In order to achieve the desired result you can manually create purchases of product pairs from your store and thus create new records for product pairs usually bought together. Thus you can faster get the desired results instead of waiting for the module to collect the necessary data itself.

Can you explain how you create product pairs? 

thanks

You can manually create usually-bought-together product pairs by creating purchases in your store, buying together products that you want to show as usually-bought-together products later on your store. Making such purchases you will generate records in the AlsoBought module for the products that you want to show as usually-bought-together products.

Hope this helps.