Linking a subform after data import

Linking a subform after data import

Hi,  Im trying to import my data and structure from an access database into Creator.  While the import works, after I have edited the forms i want to add subforms based on their relationship.  I can set this up but there is no way I can see that links the 2 records.  Please can you show me how to link a subform to its parent after data import?

Thanks
Amy