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I can't figure out how to make a button being pressed add or subtract a numeric field.

Level 1
Level 1

I am trying to create a ROI (return on investment) calculation PDF.  I have a numeric field that I want to have increase or decrease by value X when I press an "up" or "down" button.  I can't figure out how to connect a button to a numeric field where it dynamically changes its value. 

I'd like to use 4 sets of these variable where the numeric fields will effect other fields below which will be auto calculated.

When this form is created I then want to to work on an iPad.

In Excel I can do this using Spin Buttons - and on an iPad using Numbers you can do this using a Stepper.

Any help would be amazing, thanks!

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