I have a requirements to delete records greater than LRECL=15000 in a File.
As stated, this question makes no sense.
For a RECFM=FB file, LRECL=15000 means that each record is exactly 15000 bytes so you can't have a record greater than LRECL=15000.
For a RECFM=VB file, LRECL=15000 means that the maximum record in the file can only be 15000 bytes so you can't have a record greater than LRECL=15000.
Now if you really mean that you have a RECFM=VB file with an LRECL>15000 and you want to delete records with an RDW length>15000, you can do that
with the DFSORT OMIT statement BillyBoyo gave you. If you mean something else, then you have to explain more clearly what it is you want to do. An example of input records and expected output records would help.