QB Issue Resolution:

The issue is the item list and organizing it so that you can find the league and then the team, and then the item

QB has one item list, all items are unique, no matrix (attributes) inventory at all

You can use an inventory item as a place holder, and that is what you would have to do, something like this

league name
>> team one
>> >> shirt, S
>> >> shirt, M
>> >> etc etc
>> team two
>> >> shirt, S
>> >> shirt, M
>> >> etc etc
league name
etc etc etc

You can not select an item on a sales invoice, receipt, estimate, sales order or purchase order without using its name

Resolution for Issue 'What is the best way to set up items with sub-categories?' available: Yes (Solved).
Source: Intuit Community forum.

What is the best way to set up items with sub-categories?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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