You could try a union all statement if these are two tables from the same type of datasource. I see from another post that you are using CR 8.5, and in 8.5 you can't change the initial select statement, so first create a report that uses the Cus table. Place the name and address fields on the report, and then go to database->show SQL query which will show something like:
SELECT
Cus.`name`, Cus.`adres`
FROM
`Cus` Cus
At the end of this statement, add:
Union All
SELECT
sup.`name`, sup.`adres`
FROM
`sup` sup
Note that there must be the same number of fields in each half of the union all, and that they must be in the same order.
When you go to preview, the {Cus.name} and {Cus.adres} fields will now include names and addresses from both tables.
-LB