You can define your path in cmd with the TFPT. And then, from there, you go to the destination folder or workspace where you want to unshelve your code.
1. c:\>path = %path%;C:\Program Files (x86)\Microsoft Team Foundation Server 2010 Power Tools
2. cd c:\[some location]\"destination workspace"
3. tfpt unshelve /migrate "NuGet Build" /source:"$/ProjectName/Main/Source" /target:"$/ProjectName/Main/Target-NuGet"
Here you have a video that explains this.
Link http://msdn.microsoft.com/en-us/vstudio/cc896548.aspx