Try the below..Sheet1 is the 1st sheet and Sheet3 is the last sheet...Try
inserting new sheets inbetween...Keep the first and last sheets names
constant...and always make sure to insert in between

=SUM(Sheet1:Sheet3!AD8)

--
Jacob


"musha-bsuha" wrote:

I'm trying to sum data in Sheet1 from 50+ other sheets in the same file,
using =SUM(EUN1!AD8+EUN2!AD8+SV!AD8....and so on. However, I need to ammend
the formula every time new sheet is added.

Is there a formula which will automatically count the values in the
respective cell in all sheets, irrespectively how many are added?

Thanks a million!