QB Issue Resolution:

To create a Product we’ll go to the Gear > Products and Services > New. We can fill out all the information in here and then we will click Save!

To create a Sub-Product we need to be on the same product and services screen as before and we’ll click on new. From here once we’ve put all the information in at the top we’ll see an option that says “Is a Sub-Product/Service”. We’ll click on the box next to it and choose the product/service that we want it to be attached to!

Resolution for Issue 'How do I create a Product with sub products for which we track inventory?' available: Yes (Solved).
Source: Intuit Community forum.

How do I create a Product with sub products for which we track inventory?: 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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