This database is an example of a One-Many-Many Link using
two subforms.  The Tables are copies of the Tables from 
NWIND.MDB.

Linking the subforms is accomplished by linking the Order
Details Subform to the unbound control, 
MasterLinkFieldforOrderDetailsSubform, on the main form 
Customer Summary and using a macro the make the value of 
the unbound control equal to the Order Id field on the 
Orders Subform.

Their are two simple macros in  the macro Orders Subform.
One macro On Current Macro is attached to the On Current
of the Orders Subform and sets the value of the unbound 
control.  The other Macro in the Macro group Orders 
Subform, On Open Macro, makes a control active on the 
Customer Summary form.  Without this macro the On Current
will fail when Customer Summary is first opened because 
the main form will not be initialized.