Hi, You may be interested to know how to create PivotPivot gallery.
- Login to the SharePoint 2013 site as an administrator
- Click on the Settings icon and choose Site Settings from the drop-down menu
3. Navigate to the Site collection features under Site Collection Administration header
4. Make sure that PowerPivot Integration for Site Collections feature is activated. If not, activate this feature
5. Click on the Settings icon and choose Add an app from the menu
6. Choose PowerPivot Gallery app
7. Provide the name for your PowerPivot Gallery and click Create
8. Now you can see that PowerPivot Gallery has been added to your SharePoint site
http://blog.plexhosted.com/2015/05/30/microsoft-sharepoint-2013creating-a-powerpivot-gallery/