I also had the similar question as how to create a format from a dataset. I found following two sources useful.
1) SAS Documentation: https://documentation.sas.com/doc/en/vdmmlcdc/8.1/proc/n1e19y6lrektafn1kj6nbvhus59w.htm
2) A paper with title "Creating a Format from Raw Data or a SAS® Dataset " by Wendi L. Wright : https://support.sas.com/resources/papers/proceedings/proceedings/forum2007/068-2007.pdf
The paper is of 2007 and in documentation, a table named 'The CTLR Dataset' gives lot of information. However, if there is any better way of understanding it, please let me know.
- Dr. Abhijeet Safai
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