I am unable to attach workbook, but can email, so please provide me email id.
You would have to use a parameter, this won't update automatically when the data changes though.
You should be able to attach a workbook by choosing the advanced editor while you are posting.
I have added the workbook to my 1st post. Don't know if it make sense or not.
I want to this rolling sum in a trending manner rather than individual months.
Let me know if you require any other details from my end.