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.

Susan Harkins shows you two easy ways to populate an Excel UserForm, and neither requires a single bit of VBA code.

Excel VBA allows you to call an external function or module with a simple "=NameOfFunctionToCall" entry in the code syntax. However, in .NET applications, you should always use the "Call ...