Neartail does not have the option to look up data from google sheets, but you can enable the inventory option for a product and enter the available stock in Neartail. Neartail automatically keeps track of the product orders and updates the available stock. When the stock becomes zero, the product is marked as sold out. Login to Neartail > click on the form to open it > Edit page will be displayed > In the Neartail Edit page, click on a product to select it > click on the settings gear icon for that product > Product settings page will be displayed > click Advanced > enable the inventory option and update the available stock.