QB Issue Resolution:

Click on Expenses on the left bar and select Vendors.  Then click NEW VENDOR in the upper right corner of the screen.

Resolution for Issue 'How do I create Vendors?' available: Yes (Solved).
Source: Intuit Community forum.

How do I create Vendors?: 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 left bar
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Error Recovery for left bar [Canada]
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