Update 2021-05-21:
Original post:
To create a morph preset, we import a character of the Genesis generation that we want to make the preset for. The character must also have any geografts and clothes that we want to include in the preset.The buttons for saving and loading morph presets are found in the Morphs section of the Setup panel.
Select the parent rig and press Save Preset. A file selector opens up in the directory specified in the global settings. Choose a name for the preset and save the file.Now load a different character, which however belongs to the same Genesis generation. Select the rig and press Load Morph Preset, and select the preset file that we just created. All morphs are loaded to the new character.
Morph presets are of somewhat useful by themselves, but their main use is in combination with Easy Import. Morphs must be loaded while bone names and meshes are still intact. This means that morphs must be loaded before geografts and lashes are merged with the main character mesh, and before the armature is converted to some more animator-friendly rig like MHX or Rigify. The used to limit the usefulness of Easy Import, because only standard morphs could be loaded at the right time. If we wanted to load custom morphs, the last steps had to be done manually, after the custom morphs were loaded.
We can now enable Transfer Shapekeys, Merge Geografts and Merge Lashes, knowing that these operations will be performed after all morphs have been imported. We can also choose a rig type which changes bone names like Rigify.