If the option is grayed out—not available—in Excel 2003, then it could be because the data table has been defined as a list. Hello, I am trying to add sum and a count w/in the pivot table but the custom field is disabled. Otherwise, it might be a one-time glitch. The Subtotals option on the Data menu is normally available for adding or removing subtotals to data tables. http://www.contextures.com/excel-pivot-table-subtotals.htmlThe outer fields in an Excel pivot table automatically show subtotals. When I select the 'INSERT' button the 'pivot table' is greyed and I cannot create a pivot table. By using Custom Calculations, for example, you can calculate the difference between two pivot table cells, percentages, and percentage differences. I'm running a set of data via power query and has dumped them into a Pivot Table via Power Pivot . In the PivotTable Options dialog box, go to click the Total & Filters tab, and then make sure to check Use Custom Lists when sorting option under Sorting section, see … Excel pivot tables provide a feature called Custom Calculations. 1. In the Filed Setting the Custom option is greyed out . A simple method would be to create an inline Table using the Source field and giving the 'A-' records a value of 'A' and the remaining 3 a value of 'B'. Custom Calculations enable you to add many semi-standard calculations to a pivot table. So far so good however the result in Pivot Table can't do Subtotal? 2. To quickly display or hide the current subtotal, right-click the item of the field, and then select or clear the check box next to Subtotal "