Cumberland1:
To elaborate on Support's answer, Toolkit for Adagio is like a Swiss Army knife; it has a variety of components that add features to Adagio. You can buy all components or only the ones that you need. In your case you would need the Customer Number Change component.

The Customer Number Change capability allows you to change customer "ABC" to "XYZ" (you can also combine 2 customers together). The software searches throughout your database and finds every occurrence of "ABC" and changes it. This applies across AR, OE, Sales Analysis etc.

The software looks exactly like Adagio so it is easy to learn. It is extremely reliable, fast and well-supported. The pricing is reasonable, especially if you are purchasing more than one component.

Ask your Adagio dealer for more information.