adding values of a column based on another column content

Hi,me again

Last one today since i need to stop digressing and get on with some work

If i have 3 columns and a total box

A = Income
B = Paydate
C = Paid

the total box is outstanding payment total

What i am trying to achieve

Col A values to be totalled in Outstanding payment box if no date is in col B.
once a Date (paydate) is input into B then the outstanding payment be removed from the outstanding total. I have a col C (paid) with a "yes no" drop list but would prefere not to use it if it can be done using the date box.

thanks in advance

Nearly

This gave me the sum of all income paid (valies with pay dates) instead of the outstanding (values with no pay date)

It has however worked fine since i have a total income box and have deducted the sum of paid from the total income to reveal the outstanding payment.

now all i have to do, is do some actual work to to create the "paid" instances so i can afford to keep working at home and messing about with stuff which really doesnt relate to my income other than me being able to see whats going on.

many thanks Excel meisters

cheers

I tried inverting the "<>" to "><" to no avail.
As a matter of interest what (if at all) language is this? or is it simply knowing how to use excel properly.

thanks again

Gidoen