It's not only possible, it's "normal". The data should only be in the database once, on one of the two tables, and you use what's called a "join" between the different tables to get the data to appear together on a single report or form.
Please post the structures of the files. Just list the table name and all the field names and field types. Put the word code in square brackets [] before the list, and /code in square brackets after the list, and that way the forum won't squash the spacing out of your layout.
It'll look like this
Code:
Table MyTable
ID Key
Name Text
Age Number
Notes Memo