My 1st tab is a summary report... references information for all the other
tabs. I want to be able to automatically update the summary report on the
first tab, by entering the day # of the year, and from this... the reports
will automatically reference the next row (based on day) on the other tabs -
so that I don't have to manually update each of the references in my report

meaning...

I start out with this formula in the First Tab: ='tab2'!C94
but I want to make the row 94 dependant upon a cell in tab1, so I'm trying:
='tab2'!C(Y2)

but this is giving me an error message. Does anyone have any suggestions
how I could proceed?