How to add Message when Printing Customer Statement

Summary:

I want to add Message 1 to Message 7 when running the Create Customer Statement Program.

Content (please ensure you mask any confidential information):

While running the Create Customer Statement Program, business would like to include additional generic messages (Messages 1 to 7) while running the

for some customers.

Could you please let me know on how to set this up so that they appear in the LOV and how to enable it for only some customers

Attached is the screenshot

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