If you need to create work item mappings for migrations between TSF Servers, you should have a look at this nifty Codeplex utility http://tfsintegrationmapper.codeplex.com/.

Start the utility, select the servers, select the team project, select the work item type and create the mapping:

Select export and you get the mapping you can now insert into your TFS Integration Tools session configuration:

As the authors state: “This will help you very quickly create mappings between work items rather than doing it manually (a very time consuming process)” :)