hi jim chan
try this step
1-Right click on pivot table cell where YTD or Forecast YTF or % Difference are where
3-Select Background colour what you want
hope this help you
Thanks & Regards
Turn on the Design Grid by selecting from the drop-down menus: [View] / [Design Grid]
Then right-click on the Pivot Table and select [Custom Format Cell] in the pop-up menu.
Lastly you navigate to the cells you want to format - which allows you to navigate the headers too
and set the right background there.