Sum product costs with same ID in Power Query - powerbi

Question

I have multiple rows with same ID but different products/prices. I would like to get this in Power Query (PowerBI) due to the automation.
Excel formula looks like this:
=SUMPRODUCT(IF($A$2:$A$7=A2;$B$2:$B$7))
And the table is:
A (ID)
B (price)
1
10
1
20
1
5
2
3
2
6
2
1
My goal is to get this:
C (Formula-price)
35
35
35
10
10
10
This step represent Column P & Q (Claims List) in this sheet: https://docs.google.com/spreadsheets/d/1J_nl2_Dgam7JDdyzX-urrO2AEXuCzhQkB1nogTLn2eA/edit#gid=0

Answer 1

In powerquery, right click and group on ID. Add a sum of one of the number columns and then below that, choose All rows as the operation.
After grouping use arrows atop the new column to expand the other columns
Sample, without the expansion
let Source = Excel.CurrentWorkbook(){[Name="Table3"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}, {"Column2", Int64.Type}, {"Column3", Int64.Type}}),
#"Grouped Rows" = Table.Group(#"Changed Type", {"Column1"}, {{"Count", each List.Sum([Column2]), type nullable number}, {"data", each _, type table }})
in #"Grouped Rows"

Answer 2

So I am guessing a little bit but I think you would like to add the sum of B(price) grouped by A(id) to every row in your table. And you would like to use Powerquery for that.
First step would be to import the table into powerquery, then I duplicate the query and group it by ID. The third step is to merge these table by ID
Step 1
I took the following example data
Goto Data/From Table/Range and you should get
Step2 Right click on the query above and select Duplicate
I named the result sumTbl , grouped it by ID and with price as the column to sum
PS In the above step you can change to Advanced and add a second aggreagtion level and then expand. No need to merge!
The result looks like
Step 3 Now you merge both tables. I merged them as a new one
The result is
Now you only need to expand the column sumTbl
The result will be