Memorializing cell content
I have a column that calculates a date based on 'Column XYZ - 127'. This works perfectly. However, if 'Column XYZ' changes then my destination column will also change (obviously). But I want to preserve what the date WAS before it got changed. So I thought to insert a 'Helper' column and copy the date from destination to helper. However, if I simply use a =Destination@row and 'Column XYZ' changes then destination column AND helper column change. I need to copy the date from destination column to helper while ideally the helper column will then not change again.
Is there a function to copy simply the value as opposed to the operation?
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