Over on Dynamics GP Blogster, Mariano Gomez takes a look at how to add trailing asterisks at the end of the check amount in works. Mariano provides details, screen shots and everything you could want to make this happen.
Add Trailing Asterisks After Check Amounts in Words
Archived post from 2008. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.