So I'm trying to understand the input and output accounts for the product category cards.

For the Accounts Properties it makes sense that:

Income Account: Sales.Subcategory so it shows up in P&L as Income 

Expense Account:Inventory.Subcategory, because I guess this is what connects it to COGS in the P&L?

For the Account Stock Properties it makes sense that:

Stock Input: Inventory.Subcategory

Stock Output: COGS

Inventory Valuation: Inventory.Subcategory.

Now I just ran into an issue.  We bought this new product and created its subcategory under a parent called Lineas Complementarias > Loctite.  But a specific account for loctite was not created, only the Product Category.  So it was configured like this:

Income Account: Sales.ParentCategory

Expense Account: Inventory.ParentCategory

Stock Input: Inventory.ParentCategory

Stock Output: COGS

Stock Valuation: Inventory.ParentCategory

What will be different in my reports about those subcats that have both (Product Subcat and an Account Subcat) and those like this one Loctite which only has a Product Subcat but is tied to its Parent Accounting Subcat?