There are five cells involved
Cell B1 is date requested (Preference 4)
Cell B2 is date ordered (Preference 3)
Cell B3 is date supplied (Preference 2)
Cell B4 is date the project ends (Preference 1)
Cell B5 is the calculation of dates.
If there is not project end date then the formula needs to count the difference by preference. If there is a date in B1 then it will compare today to that date by the days difference i.e. =today()-B1. But if there is a date in B2 then the preference is to use today()-b2 and if there is a date in B3 then that is the date to be used next. And once a date is entered to complete the project then cell B4 over-rides all the other dates. I hope this makes sense.
Cell B1 is date requested (Preference 4)
Cell B2 is date ordered (Preference 3)
Cell B3 is date supplied (Preference 2)
Cell B4 is date the project ends (Preference 1)
Cell B5 is the calculation of dates.
If there is not project end date then the formula needs to count the difference by preference. If there is a date in B1 then it will compare today to that date by the days difference i.e. =today()-B1. But if there is a date in B2 then the preference is to use today()-b2 and if there is a date in B3 then that is the date to be used next. And once a date is entered to complete the project then cell B4 over-rides all the other dates. I hope this makes sense.