See Step 5/6 in the second link.
UCLA introductory tutorial on macro variables and macros https://stats.idre.ucla.edu/sas/seminars/sas-macros-introduction/ Tutorial on converting a working program to a macro This method is pretty robust and helps prevent errors and makes it much easier to debug your code. Obviously biased, because I wrote it 🙂 https://github.com/statgeek/SAS-Tutorials/blob/master/Turning%20a%20program%20into%20a%20macro.md
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