XL2000

I have two workbooks, FOODCOST.XLS and INVENTORY TRACKING.XLS that are
individually updated monthly via macros

In INVENTORY TRACKING.XLS:
Cell B42 currently contains the formula
=SUMPRODUCT(('C:\DATA\EXCEL\[FOODCOST.XLS]Nov'!$M$5:$M$34)*('C:\DATA\EXCEL
\[FOODCOST.XLS]Nov'!$K$5:$K$34="Sysco"))
Cell G42 currently contains the formula
='C:\DATA\EXCEL\[FOODCOST.XLS]Nov'!$E$36

FOODCOST.XLS is updated monthly to add a sheet with the abbreviated name
for the next month. Is there some code I can add to an existing routine in
INVENTORY TRACKING.XLS that would automatically adjust these formulas to
refer to the latest month's sheet in FOODCOST.XLS?

Or could I change something in the formulas themselves that will tell them
to look at the range(s) in the latest sheet in FOODCOST.XLS?

--
David