QB Issue Resolution:

There is not an option to create graphs however our products are evolving constantly and to assist us with your requirements, and hopefully get them implemented, we encourage you to leave feedback from within the product

Resolution for Issue 'I’ve added Journal entries going back to 07/08, and I can compare one year to another in profit & loss, but any way to create graphs using multiple years…?' available: Yes (Solved).
Source: Intuit Community forum.

I’ve added Journal entries going back to 07/08, and I can compare one year to another in profit & loss, but any way to create graphs using multiple years…?: 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 Graphs
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Error Recovery for Graphs [Canada]
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