Addition Of Values In A Single Cell

see the attached sheet. It already has some example....I need the result of the addition in the cells of column F, at the side Say column G, in the coressponding row. e.g for cell F9, I need the result in G9, and so on. For testing, step 1. Select M+R in Col "TOI", enter some value in the pop up. step 2. Again select M+R in "TOI", enter some value in the pop up. the Col F will have some additions (e.g 1+2), for which I need the result in the corresponding next column. i.e col G.