Creating a new pivot field (sum of two fields)

[bdav1216]

How would I create a new pivot column that is adding up the values of 2 columns within the pivot. I would like to then use this new field in a pivot chart.

See the attached:

Column B (0 column) + Column C (1 column) should be added up to create a new column within the pivot.

Thank you!

[Ariff_Chowdhury]

Here you go