Cloning a build definition could be a very useful feature to save a lot of rework and time. Cloning build definition feature is available via Power tools (not available with default VS or Team explorer installation).
For example if you have VS 2013 installed you need power tools 2013 but you may connect to TFS 2012/2010 from your client.
You can install TFS power tools from here:
Visual Studio/TFS 2013 Power tools: here
Visual Studio/TFS 2012 Power tools: here
During the power tools installation make sure to select (include) required features to use