Cell formula Help
 

L M N O
Register Bank Cash Cumm
Money Deposit Over Cash
(short) (over)

4 $704.89 $704.32 $-0.57 $0.57
5 $766.86 $769.44 $+2.58 $2.01
6 $563.71 $563.61 $-0.10 $1.91
7 $678.18 $677.86 $-0.32 $1.59
8 $875.26 $875.15 $-0.11 $1.48

How do I create the formula for column O4,O5,O6 etc. Having troubles
in the O column if there is a positive number in column N5, because
if the next row
N6 is a negative number is not working. How do I create this master
piece.
Myrna