Too many different cell formats
 

Dear All

I have a quite big excel and i am trying to make some changes in format and
i receive the message "Too many different cell format"

Probably i have many different cell formats.
From where i can set up the format in order to know what must be the format
of the excel file?
I need away to identify the format from all sheets in order to give to the
all sheets as common format as i can.
Any ideas?