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Make Formula Cell Appear Empty Until Data Is Entered

I'm creating a "universal-fluctuating" vendor inventory return worksheet for a auto parts store that consist of one criteria (cores, warranties, or N/R ) and will return one or two results of core cost and/or unit cost. This part of the task I have accomplished by using a drop down list for my criteria and my results will appear in two different columns using a Vlookup table. The problem is due to inventory fluctuating from cores and waranties on a month by month basis, vendor requiremnts differ for the number of units returned, and last make the boss happy on ink and papers supplies :D I was wondering if it is possible loop my code in a given column where it will move my code to the next row untill I reach a grand total?

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