With those three columns of data in A, B and C, try:

=SUMIF(B1:B4,"*mobile*",C1:C4)

--
"Actually, I *am* a rocket scientist." -- JB

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"Vishnu" wrote:

i have three fields like
Date description amount
1/2/9 Mobile bill 45
25/2/9 Lycatel (mobile) 5
27/2//9 Shopping (cloths) 50
28/2/9 Mobile service 15

I need sum of all amount which description "mobile",