I have a column total that should be adjusted by (a cell total multiplied by another cell)

I'm not sure how to describe this issue in an elegant way so it is easily understandable. My Excel experience is limited...

Our operation raises cattle for market and there are many factors we need to track to prove profit or loss. I have a Total Weight for cattle on hand (Cell G45) and I need to subtract the weight of the cattle that die from G45. Column S has the number of cattle that have died and Column I has the avg weight when they were purchased. We use FIFO accounting...

My goal is to scan Column S for a value and then multiply that cell value, where one exists, by the corresponding avg weight cell value in Column I and then subtract THAT value from the total weight in cell G45. Cell 45 is (=sumG42+G43). So, in the spreadsheet I've uploaded there are current death values in cell S35 and the corresponding weight value sits in cell I35. S35 should be multiplied by I35 to get the weight value to subtract from the total but the equation I need should take into account possible future deaths which may be represented in entirely different cells in S35.

Any help is appreciated!

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