To import a PATRAN neutral file, use the File/Import/Patran file menu item.

File → Import → Patran file

In the Choose a file panel, select the appropriate .pat file and click Open (or double-click the file name). You will then be prompted to specify the simulation where you want to store the mesh from this file.

Ansys Polyman will convert the PATRAN file to an Ansys Polyflow mesh file, store it in the appropriate simulation subdirectory and create a leaf named filename.msh under Mesh file in the relevant branch of the Simulation(s) section of the project tree.