@nhatnghetinh Are you referring below screnario 

Hi @nhatnghetinh 

Would posting a dummy credit note to satisfy the invoice for customer A and raising a dummy invoice for customer B work?

Aleks

Hello,

There is no easy way to move documents from one customer to another.

We can’t change the Customer IDon a released document. As Aleks mentions, one option is to reverse all documents on Customer A and re-create them with new numbers on Customer B.

One more idea that may help:  Turn on Parent-Child Customer Relationship feature and then add Customer B as the Parent of Customer A.

Now you can provide Customer B with a Combined Statement showing documents from Customer A and Customer B combined. In Payments screen, a payment from Customer B can be applied to an Invoice from Customer B.

Aging report can be printed for each customer separately, or combined:

I hope this idea helps you.

Laura