How to: Remove or Delete an Item or Project
Project items in SQL Server Management Studio projects are Queries, Connections, and Miscellaneous files. You can remove project queries and miscellaneous files from your solution without erasing the files from storage. Remove a project or item when it is not useful in the current solution but you want to include it in another solution.
A removed item still exists on the file system. Therefore, you can add a removed item to its original solution or to another solution.
You can delete a project permanently, but you first need to remove any references to the project from SQL Server Management Studio solutions, and then use Microsoft Windows Explorer to permanently delete the associated files from storage.