I have the following spreadsheet

A B C
1 Data AA Data AB Data AC
2 Data BA Data BB Data BC
3 Data CA Data CB Data CC
4 Data DA Data DB Data DC

Now, given that information, I want to reference this data in another
spreadsheet as such:

If "Data AA" is selected, I want for "Data AC" to be returned in the next
column. If I change the first column to Data "BA", I want for "Data BC" to
be automatically returned.

I've tried the LOOKUP formula without positive results. I would program it
to read what's in Column A, compare it to the data range, and it would return
something complelely on another row. Now, granted, in this table, I have 200
entries.

Anybody with any ideas? They'd be greatly appreciated!