A family of Microsoft relational database management systems designed for ease of use.
Hmmm....
Shouldn't a Form have a SubForm, and a Report have a SubReport?
Regardless, you should be able to filter the report so that it displays information relevant to the selected customer only.
This can be done in a variety of ways, with the most common method probably being the use of the CustomerID from the form being passed as criteria to the query that is being used as the Recordsource for the report.
Here's an example of a query's SQL string that does just that:
SELECT tblCustomers.*, tblCustomers.CustID
FROM tblCustomers
WHERE (((tblCustomers.CustID)=[Forms]![frmCustomers]![CustID]));
(This query would also be used as the recordsource for the main report.)