Thank you for your post.
You can still lookup a value from the same table.
When you set up your relationship, click the bottom left icon to add a new table. Select the existing table, and the screen will show a second occurrence of the table with the extension "2". Link the key field from the current table to the key field in the second table occurrence. The rest should be self-explanatory.
If you need additional assistance, or need clarification for any of the above steps, please let me know.