QB Issue Resolution:

You can definitely add different hourly rates. Name them something unique so you are not confused. You may have to view the paychecks prior to creation to add the different rates in a payroll run. Of course online payroll is different from desktop

Resolution for Issue 'Can I assign different pay rates for same employee when he does different jobs. If how do I calculate his hows with different hourly pay for each.' available: Yes (Solved).
Source: Intuit Community forum.

Can I assign different pay rates for same employee when he does different jobs. If how do I calculate his hows with different hourly pay for each.: 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 different pay rates for same employee
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