Please how do I create a table having a column of automated calculation

Question

I tried to create a table on sql server though am still a leaner in sql database management. I need to create a column that is a final payment column that automatically generated it values by getting the difference between two other columns,
What should I do ?🤷🏾‍♀️

Answer 1

Could you please illustrate the table structure, share some image for both the tables..