QB Issue Resolution:
No. QB online does not have group items, subtotals, discounts, sales tax items you can use in the body of the invoice, and other types of items QB Windows has.
Resolution for Issue 'Does QBO have item groups?' available: Yes (Solved).
Source: Intuit Community forum.
Does QBO have item groups?: 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.Support for Group Items
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Error Recovery for Group Items [Canada]
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