I cant tell for sure which way you are adding up, rows or columns. But it appears you want to total horizontal if so here is one solution.
Insert two blank columns before the data, (Col A & Col B)
Make your sum formula sum from Column B to your last column of data. Hide column B so that when you insert new columns, you will be inserting from Column C. Then you sum formulas will include any new columns that you instert.
Hope this helps.
Rod
In addition to your Summary Worksheet add 2 more
worksheets between which all of your weekly
sheets should be placed. Supposed you used
sheets named --> and <-- as your "boundary"
sheets... then the formula, =SUM('-->:<--'!A1),
entered in you Summary sheet would sum cell A1 of
any and all weekly sheets. These boundary sheets
could be named Begin and End... or anything you
like.
Yes im adding horizontally, but im not sure I understand. essentially I want to sum every 4th cell across the row into the first cell, and if I insert another 4 columns into this the fourth cell which resides in the fourth column would be part of the formula.
Thanks
Casey
I think I see what you are looking for. Try this, As I said before, hide Column B, and Enter this formula in Column A. (Using row 7 for example)
=SUM(IF(MOD(COLUMN(B6:IV6)-2,4)=0,B7:IV7))
This is an Array "CSE" Formula so after you type this formula in, dont press enter you must press ctl+shft+Enter. If you do the formula should look like this
{=SUM(IF(MOD(COLUMN(B6:IV6)-2,4)=0,B7:IV7))}
This formula will sum every fourth column starting from column C. As you insert columns your formulas will update automaticly.
For more help on CSE formulas, see
http://www.mrexcel.com/tip011.shtml