yes, a subform would be a standard solution. mainform bound to tblOrders,
with perhaps a combobox control to pick the customer, subform bound to
tblOrderDetails - making sure the relationships are set and enforced in the
Relationships window.
can the individual detail records of a single order belong to more than one
customer, in your business model? if not, i'm wondering why you have
customers records linked to directly to order detail records. ordinarily,
the customer record would be directly linked to the order record, with the
order record linked to order detail records; thus an *indirect*, but easily
traceable, link exists between customers and order details.
hth