I would like to automatically fill a field in each record of a subform with data in other field.

For example, the subform contains fields (field1 and field2) and field2 is populated with two records. I would like the date from the main form to populate field1 of those two records in the subform.

I've tried the Forms!Mainform!Subform1.Form.Field1=Me.dtDate

However, this only fills field1 of the first record.

Any ideas??