How to: Add and Remove Items to SharePoint Features
When you create a SharePoint solution, Visual Studio adds the default SharePoint project items to your Feature. Before deployment, you can add and remove SharePoint project items to modify the SharePoint Feature.
To add SharePoint project items with the Feature Designer
Open the Feature Designer. For more information, see How to: Customize a SharePoint Feature.
Select one or more items in the Items in the Solution list.
Click the Add button (>) to add selected items, or click the Add All button (>>) to add all items.
Double-click an item to move it to the other list. For example, you can double-click an item in the Items in the Solution list to move it to the Items in the Feature list.
The SharePoint Project Items appear in the Items in the Feature list.