JCL to copy N records from the Mth record of a File

The Following jcl can be used to copy N number of Records from the Mth Column of an Input File to the Output File

//STEP020  EXEC PGM=SORT                        
//SORTIN   DD DSN=<INPUT FILE>, DISP=SHR
//SORTOUT  DD DSN=<OUTPUT FILE>,DISP=SHR
//SYSIN    DD *                                 
  SORT FIELDS=COPY,SKIPREC=50001,STOPAFT=20000
/*                        
//SYSOUT   DD SYSOUT=*    
This will Copy 20000 records starting from the 50001th Record of the input File.