i want them Set countdown to just be what the first input is (i already know how to do that)
and the second countdown to be - The first countdown + the rest time input (the second input)
is that possible?
If you are able to get the times (numbers) into the data base. Then, you might / should be able to do Math with it. I would look at the Adalo documentation to learn how to do math.
This all assumes that I am understanding what you are doing. You explained it well. But, I woul try adding a “Use-case” So, more people can understand what you are trying to do, and you may get more help.
i.e. A person needs to run twice, with a break, and i need to add the times. (real world context)
Beyond that, I don’t know how to solve this. Experiment. Or, ask yourself if you REALLY need it.