there is a table calculation window sum that can be used
Understand - it is working on the table that underlays the specific work sheet so the month (complete) and the count need to be in the table
it returns this
Thanks for a quick reply Jim, looks like this works !
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Sorry - it is a table calculation that can only be used on the worksheet where it is created
seeing your need you are back to a parameter to set a start date and doing date functions to set the range