You should really take a look at the morph injection docs on the DAZ 3D site, there's a lot of details that can help you.
The skinny: you can inject a morph via a PZ2 if the original CR2 has a morph channel available or if you want to overwrite an existing morph channel. 
Once you have your morph you can use this script http://forum.daz3d.com/viewtopic.php?p=649451#649451
to create the INJ/REM files.
If you have made your figure yourself and you want to include the morph to it simply save the file as a CR2 and it will work for both Poser and Studio.

If you develop under Studio you should use the Morphg Loader/Morph Loader Pro and then the Figure Setup Tool Bundle with the CR2 exporter. Those are great tools that make the job of creating Poser figures a lot simpler than what is in Poser.

Hope this helps

Paolo

https://www.preta3d.com
FB: https://www.facebook.com/RealityPlugIn
Tw: @preta3d
G+: https://plus.google.com/106625816153304163119
The Reality Gallery: https://reality-plug-in.deviantart.com