How to separate taxes for home and businesses

2020 Home and Business:  Both my wife and I have W2's for "home" taxes but we also have separate businesses we file for - I'm never quite clear how to separate what taxes are due from "home/W2's" and how much each separate business owes?  I keep track of the amounts due after first entering all home/W2 info, then when I add each business separately.  But, still confused, hoping someone can assist as my wife and I want to keep our business taxes due directly tied to the individual businesses.  Thanks!