For each cell in column B I want to test if the adjacent cell in column A is
10 and if it is set the B cell the same as value in the A cell (this bit
is easy) and also set a cell in column C with the value "100". However the
reference of the column C cell is dependent upon the value (between 1 - 4)
in the adjacent cell in column D. For example (I know this isn't possible but
it may help to explain the idea), applying the formula in B1:

if(A110,"20", C(D1)="100").

If A1 was 8 and D1 = 4 then C4 is set to 100 and if D1 was 2 then C2 is set
to 100. What I really want to know is is it possible to use integers from
another cell to reference a cell? Any help would be much appreciated.