is it possible to write DSUM which calculate only the latest 15 times ?

[netanel99]

hello excelers

I'm placing dsum on a table, and want to sum some criteria I've wrote, all I need is the sum of the 15 latest match of the event I've wrote - which needs to be Sum together , I can use "helping column" in the table, but is there is more elegant way to do this with a furmula which make dsum calculate only the latest 15 cases ?

thanks for any help .!.

[RobertMika]

Could you post your workbook with example(s)