Excel (or) Power BI, Rolling Sum - excel

Question

Is there any way in Excel Pivot or Power BI to do the rolling sum of the given data (let say monthly)?
Let say I have a list of cases, each row represent case count and amount. The project start date and end date varied as follows.
For, simplicity, if I demonstrate the data graphically, would be as follows.
What I'm try to do is to aggregate how much case counts and amounts in total for each chunk of month.
My goal is to produce below list using Pivot (if Pivot is not possible, then by Power Query) directly.
I could produce monthly aggregates using Filter function and Sum, then pivot that data to produce above result.
If there is a direct way of producing that aggregates in one step, that would be better. Please suggest it for me.
Please see sample data in below link
https://docs.google.com/spreadsheets/d/1vAKElb2-V_If-MMlPwHk_VGhYr8pkOg_gQfRYRrkbtc/edit?usp=share_link
Excel file in Zip
https://drive.google.com/file/d/1QqgNUrJlBuvin7iecsxsvexrGZXFIt-g/view?usp=share_link
Thank you in advance
LuZ

Answer 1

You can load the data into powerquery and transform from left to data table on right
code for that is
let Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Added Custom1" = Table.AddColumn(Source, "Date", each List.Generate(()=>[x=[Start Date],i=0], each [i]<12, each [i=[i]+1,x=Date.AddMonths([x],1)], each [x])),
#"Expanded Custom" = Table.ExpandListColumn(#"Added Custom1", "Date"),
#"Added Custom" = Table.AddColumn(#"Expanded Custom", "Year", each Date.Year([Date])),
#"Added Custom2" = Table.AddColumn(#"Added Custom", "Month", each Date.Month([Date])),
#"Removed Columns" = Table.RemoveColumns(#"Added Custom2",{"Start Date", "End Date", "Date"})
in #"Removed Columns"
Afterwards, load the powerquery back into excel as pivot report and generate your table
Alternatively, just use use
let Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Added Custom1" = Table.AddColumn(Source, "Date", each List.Generate(()=>[x=[Start Date],i=0], each [i]<12, each [i=[i]+1,x=Date.AddMonths([x],1)], each [x])),
#"Expanded Custom" = Table.ExpandListColumn(#"Added Custom1", "Date"),
#"Removed Columns" = Table.RemoveColumns(#"Expanded Custom",{"Start Date", "End Date"}),
#"Grouped Rows" = Table.Group(#"Removed Columns", {"Date"}, {{"Amount", each List.Sum([Amount]), type number}, {"Case Count", each List.Sum([Case Count]), type number}}),
#"Changed Type" = Table.TransformColumnTypes(#"Grouped Rows",{{"Date", type date}, {"Amount", type number}, {"Case Count", type number}})
in #"Changed Type"
to generate this table, then graph it