Available options: (I) This is the area at the top of the page that displays as column c under excel. Select new column size from the column tool bar located at the top. (II) This may, or may not, be the same sheet where your pivot table is located. Determine the calculation you would like to add. (III) Enter the data to the new excel data page. Click " analyze " into the " view sources " dialog box that's pop-up. (IV) Excel will automatically display the field for all calculations you've done here. If there is more than one source, either double-click on the mass area to extract all of the formulas, or click the add or remove button on excel to root it.Choose from options above and answer: What most naturally follows?

How to calculate difference in pivot table 
Launch microsoft excel. 
Open the spreadsheet containing the pivot table and source data you are working with. 
Select the worksheet tab containing the source data.
Answer:
(II)