How to convert negative value as zero

Hi Gurus,

We have one series 1) Actual CY YTD which has one server expression and one client expression.

Lets say for Actual CY YTD = sum(A) - sum(B), if A=0, B= -10, result give me as -10, where i need 0.

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I thought of writing client expression like if(actual_cy_ytd < 0) then 0

but i already have one client expression for this series. How can I handle this situation.

(Detail Document is enclosed)

Any help would be appreciated.

Thanks,

Venkatesh