Can I set up one customer with multiple sales tax group or tax exempt number?
In standard AX, i dont think so.
Ax allows only one sales tax group for a vendor/customer? In that sales tax group, you can attach many sales tax codes.
What is your exact requirement? That will help you in getting solution
For example, our customer A registers in TX and CO to be tax exempt which means they will have different exempt certificate number. How can I sotre both number under the same customer account and apply accordingly when we ship the goods to these 2 states on behalf of our customer A.