Here Inventory can be enabled or disabled. by default Inventory management will be disabled. Here the user can enable inventory management.
How to get there!
To enable inventory in myBooks click on Settings> Business settings > Preferences > Inventory.
Enable Inventory,
In order to create inventory adjustment, production order, and tracking inventory. For this inventory have to be enabled. Click on inventory in preference and then click on enable and inventory management will be enabled in mybooks.