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TFS integration - when creating a feature be able to set the tfs area. Currently you can only map one tfs area to a single feature.
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This is already possible. Each integration maps to a single TFS area and you can have multiple integrations per product. Create an integration for each TFS area you need to map to and then rename the integration (by clicking the name at the top of the integration configuration page) and add the area name into the name of the integration. Then when sending a feature to TFS you will see each of the integrations listed in the Actions menu, allowing you to pick which area to send the feature to.
You can also send features to particular areas in bulk using bulk edit in the Features -> List view.