Is there anyway to have different price on various tasks on the same project?

Is there anyway to have different price on various tasks on the same project?

Hi,
I am using the time sheet in the project invoicing.

Sofar, all tasks in the project I have runned, have had the same pricing.

But now, I am to start a new project with a new client.

In this project, there would be three different standard task, each individual task will have unique pricing. For example. ...

Task "A" will cost 20 USD
Task "B" will cost 30 USD
Task "C" will cost 40 USD....

So my question is...if there is any way to have unique pricing to each individual task within the same project.
If so, please let me know the steps to this.

Best Regards,
Bjorn