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Q: What is PIC clause editing?

Answer:
Picture editing characters: Z=zero suppress, *=check protect, +=sign, -=negative, CR/DB=credit/debit, $=currency, .=decimal, ,=comma, B=blank. Example: PIC ,ZZ9.99- displays $ 123.45-. Insertion characters add to display.
picture editing format
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Q: Explain BLANK WHEN ZERO clause

Answer:
BLANK WHEN ZERO displays spaces when numeric field contains zero. 05 WS-AMOUNT PIC Z(5)9.99 BLANK WHEN ZERO. Shows blank instead of 0.00. Only for numeric-edited or numeric display fields. Improves report readability.
blank-when-zero editing display