I have a workbook that has several tabs. I'm only working with 2 for the
problem that I'm having though. The first tab, which holds all my data, is
called Marketing Letters. The 2nd tab is called Status. On the Status tab,
I have a cell (A5) which looks to another cell (A1) on the same tab, then
returns matching values (in multiple rows) from the Marketing Letters tab.

Here is my formula:

=INDEX('Marketing Letters'!$B$1:$V$300,SMALL(IF('Marketing
Letters'!$B$1:$B$300=$A$1,ROW('Marketing Letters'!$B$1:$B$300)),ROW(1:1)),2)

This works great, however...I am constantly adding data to the Marketing
Letters tab. Currently there's 300 rows, but tomorrow it could be 305 or by
the end of the week could be 350. Rather than changing my formula on the
status tab each time to reflect how many rows have data on the Marketing
Letters tab, is there a way to have it automatically determine the number of
rows with data?

I tried using the $B:$V, but my formula didn't work with that.

Thanks for your help!