How to: Programmatically Create New Workbooks
Applies to: The information in this topic applies to document-level projects and application-level projects for Excel 2013 and Excel 2010. For more information, see Features Available by Office Application and Project Type.
You can generate a Workbook host item for a Workbook object in an application-level project. For more information, see Extending Word Documents and Excel Workbooks in Application-Level Add-ins at Run Time.