You can copy items using Solution Explorer or Windows Explorer.
To copy items within Solution Explorer
In Solution Explorer, select the item you want to copy.
On the Edit menu, click Copy.
In Solution Explorer, select the destination project.
On the Edit menu, click Paste.
Connections cannot be copied between projects. When copying a query with an associated connection to another project, its associated connection is not copied to the target project. You must manually create the connection in the target project.