Is there a way too?

Is there a way too?

Some sort of option or function to give the customer a free 30 minutes and count it in the costs.

Example:

Customer had two hours work done on a ticket from a technician which cost €10 per hour but it wont cost the customer €20 because the first 30 minutes were free so the costs need to be modified to that criteria of 1 hour and 30 minutes. 

If anyone Could help Thx. 
:)

Have a nice day
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