If your staff have different levels of experience, you can easily reflect that on your pricing:
Go to the Personnel tab,
Select a Personnel,
Click on the Assigned Serviced section to access the list of services offered by this personnel,
For each service that is selected with a checkmark, you get the Custom icon.
Click on the edit icon and add the new duration and price for this personnel.
When customized, the value that differs from the service default price or duration is displayed in bold.
Remember to click on Save at the top of the list to keep your changes.