Draft order - non inventory

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I am the bookkeeper for an online retail store.  Recently, a draft order was created in Shopify for a quantity of 100 for a single product that had NOT been entered into inventory.   I am thinking this has created a problem, but we are fairly new to Shopify and I am still learning.  Since the products were sold before entered into inventory, doesn't this 'throw off' all the analytics of inventory?  If that statement is true, is there any way to add the product to the inventory with the original  inventory count (before sale) and then link the draft order sale to the inventoried product?