Many thanks for your quick reply.
great guys , this is perfectly working. would it be possible to generate a sequence set of values with respect to "P" sheets which means if 1st (P) sheet has a value of "1" then next "P" sheet should contain a value of "2" i,e adding +1 to the next occurrence.

For example :

P Sheet " 1 Minutes -4431 01/01/2013"
S Sheet " 0 Minutes -4431 01/01/2013"
P Sheet " 2 Minutes -4431 01/01/2013"
S Sheet " 0 Minutes -4431 01/01/2013"

Please note there is no change required for "S" sheets.