To import an I-deas universal file, use the File/Import/Ideas file menu item.

File → Import → Ideas file

In the Choose a file panel, select the appropriate .unv file and click Open. You will be prompted to specify the simulation where you want to store the mesh from this file.

Ansys Polyman will convert the I-deas 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.