Subtracting the sum of a column from a total (diminishing inventory)

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4 - Data Explorer
4 - Data Explorer

Dear All, I have an initial inventory of 2500 books. My table is tracking for me when I made small shipments of these books, and because the field type is a # field, the sum is being tidily tallied. Is there a way to ask Airtable to subtract this sum from my original 2500 as I go? Thanks!

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