I have 12 spreadsheets one for each month of the year on which I track all our expenses. I want to tally a yearly total for all the expenses. The spreadsheets are titled Jan. 2017, Feb. 2017 etc. I want to have all totals on an additional spreadsheet following the same format as the other 12. What formula can I use to total B31, C31, D31, etc. from all spreadsheets on to the total sheet.