title: Dax sum all fields with same value
body: <p>I am using Power BI and i would like to know how to sum all the fields of the same value, and then take the percentage out of the total.
  For example:
  I have the following table:</p>
  
  <pre><code>               Computer Name | Manufacturer | Errors
                       Comp1   |      Hp      |   4
                       Comp2   |      Dell    |   2
                       Comp3   |      Hp      |   1
                       Comp4   |      Asus    |   2
                       Comp5   |      Asus    |   2
  </code></pre>
  
  <p>I would like to create a measure that sums all the errors according to manufacturer, so basically it will sum all of the instances of the same value
  and return something like this:</p>
  
  <pre><code>                     Manufaturer | Errors | Count comps
                           Asus    |   4    |    2
                           Hp      |   5    |    2
                           Dell    |   2    |    1
  </code></pre>
  
  <p>And in the end calculate the percentage out of max errors.</p>
  
  <p>The part i cant figure is how to some all the errors for same field value.</p>
  
  <p>Please help me, Thanks!</p>