I want to have my status column auto fill a date in the Actual RFP Date when the status is set to RFP. But then there are more status changes that will happen after that, and I don't want the Actual RFP Date to disappear once the status is change to ...

I have 4 columns that affect each other for our woodworking shop tracking: Status, Actual RFP Date, Required RFP Date, and Manufacturing complete date. Manufacturing complete date is just a date that is entered as an ideal completion date. Manufactur...