How do i make the flexible pricing for two customers?

Hello Experts,

Scenario is:

I have two customers: 1000 and 1001.

I want to create sales orders for these two customers separately with one material (2000) using VA01.

Then created normal delivery using VLO1N

Now for billing customer no 1000, i use VF01 and saved it with some price associated with it.

But i dont want to bill customer 1001. my question is how do i make customer 1000 not relevant for billing?

How do i make the flexible pricing for both customers?

In simple words, for customer 1001 billing should not take place. (it should be not relevant for billing).

I would be very thankful if you can suggest me any solution.

Thanks and Regards

Amit