How to sum by group in Power Query Editor?

My table look like this :

Serial  WO#      Value   Indicator
A       333      10      333-1
A       333      4       333-2
B       456      5       456-1
A       334      1       334-1
A       334      5       334-2 

I want to create a new column that sums up the Values based on WO#. It should look like this:

Serial  WO#      Value   Indicator  SumValue
A       333      10      333-1      14
A       333      4       333-2      14
B       456      5       456-1      5 
A       334      1       334-1      6
A       334      5       334-2      6

Eventually I will remove duplicates on the WO# and remove the Value and Indicator Columns from the data. I can't seem to find a function in M that allows for sum by group. Thanks in advance!