How to add a formula to cutlist

I am trying to add a formula to my cut list template which would calculating a particular value based on items already presented in my cutlist for each item in my cutlist.  I can create the formula for a cell and it calculates correctly however I cannot copy and paste this formula down the column to perform the same calculation.  I want to be able to have this formula saved and work everytime I insert my cutlist however I cannot figure out how to do this.

Any ideas on how to achieve this?

Thank you

Angie

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