You might want to also post on the sage developer site. https://developer.sage.com/ 

There is a forum where you can discuss with other developers. You would probably have a better chance asking 4GL questions there. 

Thank you,

Roberto:

You can do it with import models, prepared for text files like csv, or another alternative is to create a visual basic script inside the excel file and consume on of the multiple webservices you have in X3 APIs.