I want to set a formula by which every cell of a particular column will be the sum of values of some previous columns of the corresponding columns. For example, let's say the SUM column will be column 'M'. So, M1=B1+C1+D1+E1+F1+G1+H1+I1+J1+K1+L1.
That means I actually need M=B+C+D+E+F+G+H+I+J+K+L for all rows.
Please help me, I am new to excel and can't set the formula.