using the same formula field located in multiple lists

Pip Kolmar
Apologies if this is repeated. I looked and I see similar posts but, but I specifically just want to solve the problem from my screenshot attached. If I could just use the same formula field across multiple lists, I could then roll them up in a report. All I'm trying to do is calculate the hours remaining for a scope across 2 lists which represent projects within that scope and then add them together in a dashboard so I can see total remaining hours easily. The fact that I can't is bonkers.
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Natalie Williams
I was just looking for this topic while setting up a new folder and having to put the same formulas in for 15 lists individually is such a nuisance. I can see formula fields that reference data not added to lists not working, but you should be able to add it and any other necessary fields. The use case that had me hunting for threads tonight is where the exact same formula referencing TODAY and ONE date custom field is used in 15 of 18 lists in a folder. The weird thing is that I have one of the fields showing as being located in two places, so the ability already exists. Why it's not allowed makes no sense.