QB Issue Resolution:

Same way you track any other expense

except that the contractor need to be marked as a 1099 vendor.  Then you map the vendor to the expense account you use to pay him to the 1099.  QB will track check an cash payments to the vendor for end of year reporting. (if you get him to accept paypal or a CC, you have no reporting.)

See this explanation on how to set up and use a 1099 vendor/independent contractor

Resolution for Issue 'How to track the payments I should make to a Vendor for their consulting services ?' available: Yes (Solved).
Source: Intuit Community forum.

How to track the payments I should make to a Vendor for their consulting services ?: 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 1099 Vendor
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Error Recovery for 1099 Vendor [Canada]
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