formatting currency through DM or RTF?

Summary:

when customizing a DM and RTF, I need to format the currency into $****,****.XX format.

Content (please ensure you mask any confidential information):

Should I do this in the DM or the RTF? How do I do it in both the DM and RTF?

Version (include the version you are using, if applicable):

23D

Code Snippet (add any code snippets that support your topic, if applicable):

NA