'Creating Oracle Procedure To Update Table

I'm trying to create a procedure in an Oracle database that will update the PMBPCSB with an 'X' if any of the other columns have a value present. If all of the columns are NULL then I don't want it to do anything. I'm not exactly sure how to format the procedure to accomplish what I'm wanting. Any help is appreciated.

COLUMN_NAME DATA
PMBPCSB
PMBPCFBB
PMBPCHUB
PMBCITNC
PMBCITNSB
PMBCSDB
PMBCSDVOS
PMBCVOSB
PMBCWOB


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