How to handle volume discounts in Project accounting

Hello,

Can anyone help me on the below requirement?

We need to give volume discount to customer based on the continuous relation and business volume.

We dont want to enter the volume discount as a concession against a standard invoice.

It has be created as a standalone invoice in project accounting and has to be shown separately in reporting and P&L statements.

Is there any way to handle this scenario in PA?

Is there any functionality to handle discounts?

Product version: 12.2.5.

Regards

Nagaraju