Column
Enter the column for the join.
For multiple column joins, select the Multiple column join check box.
If this is a primary join, select the Primary join check box.
For the Join type, choose between the following:
Undefined
Many to One
One to One
One to Many
Many to Many
Once you have entered the details for the join, choose the Add join button to add the join. Click Finish to close the Add Join dialog.