Try grouping the route sheets and array entering this formula in C6 and fill down. If you aren’t familiar with array-entered formulas array enter means the formula must be committed from edit mode by simultaneously pressing and holding down until you get blanks.Ctrl and Shift while hitting Enter.With the sheets grouped the formula will copy through to all the grouped sheets.
If you aren't familiar with how to group sheets click the left most route sheet tab. While holding down the Shift key click the right most route sheet tab.
When finished right click on one of those tabs and click Ungroup sheets.
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