You can:
1) Create a process: NewTestItem
ENTER NEW TestItem USING Main
2) Have a query that includes the operation from #1. Specify this operation as "below the list" and uncheck "applicable to multiple items".
When you click on the operation added in #2 above, user will get a modal form. When they click "Create", the modal form will disappear and the new item will be shown in the query.
