Column chart display only specific records

[Opal55]

Hello, I am tracking some donation data and found some measures to give me the data I want to see in a Matrix visual, but I can't figure out how to display specific records in a column chart.  To explain, the donation categories are in 3 different Groups - A, B and C.  I was able to show, with the Matrix, the data as the following:

I want to display in a column chart Group B and Group C only.  So, if I create a column chart with all 3 Groups I get this, 

But I want this:

If, I hide Group A, I get this:

How do I get the chart to display only the two groups correctly?  Thank you.

[Opal55]

Thank you, that was very helpful, but how do I show the data labels as %?  Is there a format within the Measure that should be added?

[Opal55]

I found it! In the Measure Tools.  All good now.  Thanks again!

[samdthompson · Accepted solution]

Hello, you will need a measure to achieve this. Heres the DAX but you will need to massage it to your table name, field name etc:

% of Group =

DIVIDE(

SUM(Donation[Val]),

CALCULATE(SUM(Donation[Val]),ALL(Donation[Group])),

0)