Every week a new worksheet ("tab") is made by copying the prior week's tab and adding pertinent data for the week. Several of the cells in each "tab" are a summation across all prior worksheets/tabs, giving Year-To-Date totals. I figured out how to do this by clicking the leftmost "tab" and then shift-clicking the rightmost tab.

My issue: I'd like for this to automatically happen when I create a new tab, but I get #REF's for all these references as soon as I make the copy.

I've got an idea for a workaround, but I can't get it to work:
1) Put a cell in each "tab" with the name of the "tab"... e.g. cell C3 has "525" in it.
2) In the year-to-date summation cells which normally would have a formula like: =SUM('501:525'!X7)
I've tried putting =SUM('501:C3'!X7).
Didn't work.
I've tried putting =SUM('501:"C3"'!X7) thinking maybe the quotes would let Excel know I'm trying to insert a "text string" where the sheetname/tab would normally be.
Didn't work.

Basically, I'm asking if there's a way to force a sheetname into a formula by making a reference to a cell with that sheetname in it?

Or does anyone know a better workaround for what I'm trying to accomplish?

Right now, I just manually go in and redo all the #REF's... no big deal but my curiosity has got the better of me.

Thanks