To import an Ansys Polyflow result file, use the File/Import/Result file menu item.

File → Import → Result file

In the resulting Choose a file panel, select the appropriate .res file and click Open (or double-click the file name). You will then be prompted to specify the simulation where you want to store this result file. Ansys Polyman will store the file in the Inputs subdirectory of the appropriate simulation subdirectory and create a leaf named filename.res under Inputs in the relevant branch of the Simulation(s) section of the project tree.