I do not believe Jet (the database engine Access uses) supports table-level triggers, so you'll need to use a macro or VBA code in a form to trigger the extra record.

When you create a Microsoft Access table, Access will automatically create a primary key to your database table. Still, you can also specify the field you want as the primary key for your database ...

When users create an Access database, the data is stored in the table. When individuals want to add Fields to their table, they usually add fields in the Design view. The Design View allows you to ...