Hi

I usually add together worksheets using:

= sum(start:end!a1)

which is fine but when I tried to use the sumproduct function:

=sumproduct(start:end!a1,start:end!y1)

where a1 has the gross data input and y1 has the working interest but this
gives me #ref error

I am trying to consolidate multiple worksheets which have gross data input
but I want to add the net data using the working interest in each sheet.

All the data input and working interest cells are in the same location in
each sheet.


I would appreciate any guidance to solve this problem
Many Thanks
Jolly