Problem:
when playing with PowerPivot and adding ∑Values you get the prefix Sum(…) before the value.

Solution:
1.Click on the dropdown combo on the right hand.

2. Click on Edit Measure.
3.Copy the Formula in the “Measure will use this formula” …

4.Click on the New Measure icon in the Power Pivot Ribbon
5.paste the formula to the measure settings and change the measure name.

6. That’s it. now you have a new calculated member with your own caption ( Alias or what ever)

Enjoy it!!!