Is there some kind of coding that can be put onto a sheet or workbook that
will ignore data from a prior year?

Here's the specific dilemma. I downloaded a General Ledger from the
Microsoft website through exel, new, microsoft office online, ledger,
generalledger1.

I work on a fiscal budget so, naturally, I have 2009 data and 2010 data on
the same sheet. The sheet has the following formula in it for a 2009 entry:

=SUMIF(_6652[Constructed Key
Field],"="&(TEXT(Expenses[[#Headers],[Jul-09]],"mmm-yy")),_6652[Amount of
Check])

The formula for a typical 2010 entry is:

=SUMIF(_6851[Constructed Key
Field],"="&(TEXT(Expenses[[#Headers],[Feb-10]],"mmm-yy")),_6851[Amount of
Check])

In 2009, all my information from 2009 was visible. Now that it's 2010, my
2009 data has "disappeared" but the 2010 is visible.

It's a mystery. I can't figure this out.

Thank.