Hello! I am happy with the QB essential package but I would just like to add stock management as an add on... is that possible?

Hello Andybalas-premiu, 

Welcome to the Community page, 

Stock management is not available in the Essentials package in Quickbooks, if you are wanting or needing this feature it would be a case of having to upgrade to the Plus account package in Quickbooks so you can use that feature.