Property of the script line: Inserts.
This option, which is closely linked to the property insert first page, lets you decide if the script lines that are to be inserted at every occurrence of an Insert script line should be inserted before or after the page where the date occurred.
By default, pages will be inserted, starting on a left page. If you prefer the inserted pages to start on the right (to insert a re-order sheet on October 1st, as shown below), then use the setting insert first page.
Insert before (start on right page)
Insert after (start on right page)