Thanks Andrew, however I still can't seem to get my result. I'm admittedly not that strong in F.R.

I need to to sum some accounts together. I have used:
=ADDEBIT("gldata.BAL",I89+I90)
where I89 is a $4,540 Dr and I90 is a $36,303 Dr;
so I would expect it to enter $40,843 in the cell, however it returns a 0
It is possible that the sum of these accounts could end up as a credit in which case I would use the =ADCREDIT("gldata.BAL",I89+I90) in the liability section.

I assume I'm not entering the correct formula for this circumstance?

Thanks - Sue