It seems not if you add all the schemas to the same .edmx mdoel.
Try adding another .edmx file to another folder or project, add tables of a different scheme to it, and then do the following:
1) In the solution explorer window, right-click the model.tt file and select Properties .
2) In prop. window set the Custom Tool Namespace property to the desired namespace.
3) And finally, right-click model.tt and click run custom tool .
After that, you will see that the namespace of your model.tt POCOs has changed.
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