In cell L12, I need to add across D12+F12+H12+J12; but only if there are
percentages showing in D12,F12,H12,J12.

I have formulas in those cells returning results. I do not want anthing to
show in cells L1 through L11 (null) if L12 has a total;(same calculations for
other rows). I ran into Circular referencing when I first tried this. I
changed the iteration, but then I was getting a FALSE return with the
different formulas I tried to put in, or the SUM formula just didn't work.
Please Help! I don't want 0% showing in the cell for the rows that do not
get added across, as it is now. Here's the formula I came up with:
=IF(AND(J12="",L12<""),0,IF(AND(J12<=I12,L12<"") ,SUM(D12+F12+H12+J12)))

The generosity of your knowledge is greatly appreciated.