Dynamic Column Input

S'up guys! How are you all doing?

I need a help, please.

I'm trying to create a dynamic column that receive a value from a filter on my page and then this new value recalculate another column.. something like this:

Looking simple to Excel, for example:

Cell A3 has the value 3

Column A:A receive value 3 from cell A3

Column B:B calculate "cells A"-1

And if I change the value on cell A3, all values on column A:A will change and then recalculated on B:B

Anybody knows how to do it on Power BI? If possible, at least..

I really appreciate any help.

Best,