Extract cell value if it has conditional formatting color (Excel 2013)

I have been trying to make a macro to automatically calculate the quantity I need to increase or decrease our purchase orders.

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As the On Hand quantity decreases I have set conditional formatting to determine how much we should order according to a percentage of the Stocking Level and turns the desired cell yellow. For each row the macro would need to identify which cell in columns L through O is yellow from conditional formatting, use that value and subtract the On Order quantity, then put the result in the Adjust PO Qty (+/-) column so I know how much to decrease the order if negative or increase if positive.

THANK YOU!