Subtract two columns

Anonymous , In DAx

new column = [Column 2] - [Column 1]

The information you have provided is not making the problem clear to me. Can you please explain with an example.

Appreciate your Kudos.

Hi.  Thank you for your response.

The results of my latest attempt ar shown here.  This is wrong, of course.  It should show the net amount for each line.  The first line should have 1869.95.  The second should be 1978.06, etc.

I have the two tables, _GroupEarnings and _GroupDeductions, linked by the fields _EmplAndPeriod (ie:  

One thing that bothers me is that the field, _DedAmount, has the 'sum' symbol in front of it, while the field _EarnAmount does not.  I'm not sure where that came from when I created the field, _DedAmount, or why it's there:

Hi Anonymous ,

Is [Earnings] a measure? If so, please try this measure.

_Total = 
SUMX (
    SUMMARIZE (
        '_GroupEarnings',
        '_GroupEarnings'[Year],
        '_GroupEarnings'[Payperiod],
        "Earings", [Earnings],
        "dedamount", SUM ( _GroupDeductions[_DedAmount] )
    ),
    [Earnings] - [dedamount]
)

If this doesn't work for you, would you mind sharing a sample file with no privacy? Thanks in advance.

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Best Regards,
Gao
Community Support Team

If there is any post helps, then please consider Accept it as the solution to help the other members find it more quickly. If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!

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