In trying to measure the performance during a period of time using the custom date sort, I'm seeing some strange results, where the numbers don't add up.  I'm attaching a screen shot.

Nevermind, I see now the totals of the Morninstar Industry Groups, are not a summation of the % chg of the individual stocks wihin them.  There is something else I noticed about Custom Date Sort and the timeframes its performed on, but I will post that separately....

I am happy to read you were able to figure it out on your own. The MG symbol is a percent change calculated by weighting all of its components by the square root of capitalization.