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Creating a Routine from Modified Program

A couple of weeks ago, when I swapped out a routine in FB Flex, I was prompted to save the entire modified program as a routine. This was great, as I'm avoiding certain exercises until early March due to injury rehab. Not having to check each day for planks, bear crawls, etc.—and then check each potential swapped routine for the same—is fantastic!

I'm trying to do the same thing for FB Booty, but I'm not sure how to do so without just swapping out days and hoping it prompts the "Save as Routine?" pop-up. I've already swapped a fair number of days and haven't gotten it.

Does anyone know how to save a modified program as a routine?

TIA!

ETA: For clarity, I'm aware I can copy the program as a routine and modify from there — in this case, I've changed most of the relevant days already, so am wondering about importing the whole thing as-is.

Edited