ICEM str. and unstr. mesh

sometimes1900

Hi ICEM EXPERTS, in ICEM-CFD tutorial 3D_Pipejunction i would like to first generate the horizontal pipe with hex mesh, and then using the interface element to compute the vertical pipe with tetra mesh by "use existing mesh parts".

The problem is that the interface between two pipes in the geometry does not exist. Can anyone tell me how i can generate the interface mesh?

thanks in advance.