Sum of sales based on List box selection

[Anonymous]

Hi folks,

I have following requirement.

i have one list box for Month field.. i have expression for sum(sales) . if no month selected i need to show 12 months total sales. and if i selected april month i need to sum sales upto april..(Sum(sales)for jan feb march april(accumulation))..how can i do this...

Thanks in Advance..

Regards,

Venkat.

[kushalthakral]

sum({<Month={'<=$(=Max(Month))'}>} Sales)

[Anonymous]

Thanks Neetha...for ur explanation....