How to perform calculations on two different fields in an internal table dynamically.

Hi experts,

I would like to seek guidance from you on How to perform calculations on two different fields in an internal table dynamically.

Scenario:

My internal table is having fields

SEATSMAX

SEATSOCC

SEATSMAX_B

SEATSOCC_B

SEATSMAX_F

SEATSOCC_F

I want to produce difference between max seats and seats occ to show the total available seats in each set dynamically.

Thanks in advance.