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A subfile is a 'direct' file, and can be accessed by relative record number. The field you specified in your DDS as SFLRCDNBR and in your RPG F-spec in the SFILE keyword holds the RRN of the record currently available in your program.
So, set that field or one defined like it in a loop, incrementing the field and using it in factor 1 of a chain to the subfile record format. On error or end of file you leave the loop. You will read all the records in the subfile.
I have given links to useful material on subfiles in other replies in Ask The Experts, so please look at other subfile questions to see them. ==================================
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