QB Issue Resolution:

To create a new Product or Service:

Click the Gear Icon with your company name
Under “Lists” select Products and Services
Click New

Now open the sub-product and check the box Is sub-product/service and you can assign the new parent product.

And that should do it!

Resolution for Issue 'how do i add a new parent product/service?' available: Yes (Solved).
Source: Intuit Community forum.

how do i add a new parent product/service?: 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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