Hi,
Some months ago I had a similar question and it was solved here: Formula for adding cells (with a 5 row interval)
using this formula: =SUM(IF(MOD(ROW('21 SUP'!A15:A100),5)=0,'21 SUP'!A15:A100,0))
My question this time is this:
I have a lot of columns and in each column I have to add...