formulas referring to pivot table

you need to use the cell reference and notgetpivot
so if the pivot table columns are C and D and starts in row 5

use C5 and D5

you could use a calculated field in the pivot table to do that - then when you change the pivot table and the layout changes - the calculation will still be OK

Please upload a sample of your workbook to the forum, Make sure you have removed any private information, remember this is a public forum and so available to anyone
Would like to see an example of your data and also a manual mock up of the expected results you want to achieve.

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