You mean something like this:
CALL FUNCTION 'Z_FUNCTION_NAME' DESTINATION 'PRD'.
That's all there is to it. You just add the Keyword DESTINATION and the name of a destination mainted in SM59 to the CALL FUNCTION statement. Now that I have typed this, however, I question if this inquiry really belongs in the Web Dynpro ABAP forum. This seems more like a general ABAP question.
Hint - for WDA specific functionality you can use the Service Call Wizard to generate the context and the logic to call a RFC. Was that perhaps what you were refering to.
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