Attached Link: http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2632044

There's a script to automate most if not all of the process (see linked thread).

If the end result is intended to be a for sale item, the correct thing to do would be to contact the owner(s) of the morphs used to agree what the package should be encoded against for distribution to be legal.

The simplest way to avoid encoding and the associated difficulties of wanting to distribute other peoples morph data, is to do the normal thing and make one custom morph from all your own morphs, and an INJ pose for that and any other morphs.
As I suspect some scaling is involved, you will need a pose file to apply those values properly anyway, so that information can be combined with the INJ pose to give a single pose to create the character.