Confused, on how to make order tags deduct from inventory

[Jesse]

That was already provided by @QMcKay in the above reference he gave here:

Inventory and order tags help

For an Order Tag to be able to alter inventory, you must define a Product for that Order Tag (you do not need to add the Product to the Menu, just use the Order Tag), and map the Order Tag to the Product. Then within the Inventory System, define an Inventory Item that will be related to each of the “invisible” Products. Then create a Recipes using the Inventory Items which are mapped to the “invisible” Products. Let’s use Juice as an example. Let’s say we have Orange, Apple, Cranberry Produ…

However I will help you more specifically can you show a screenshot of your Menu and then a screenshot of your Order Tags examples I will build you a step by step using your specific setup.