At present it is not possible to link two TurboGrid Sessions to a single FLUENT session. The most preferred way of utilising the meshes from TurboGrid into FLUENT, is to actually do it via CFX. If you set-up the meshes as you would do for a CFX session in CFX-Pre. Once you have the meshes set-up, write out the .def file. You can now start FLUENT and Import this .DEF file and all the Meshes are then correctly set-up and positioned ready for setting up the physics for your FLUENT simulation. The approach is an intermediate solution until this functionality is added to FLUENT directly