QB Issue Resolution:

There is nothing in QB for that, it would have to be just a company routine maybe before it is entered

Resolution for Issue 'Is it possible to flag an item (bill, expenses etc) to remember to review it later?' available: Yes (Solved).
Source: Intuit Community forum.

Is it possible to flag an item (bill, expenses etc) to remember to review it later?: 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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