Quote - Would a parameter group injection pose be where you just select specific parts, like the head for instance?

Well, any pose can be restricted to just certain actors, either by using the selection options when saving the pose or by editing the pose after saving (or creating the entire pose manually).

A parameter group injection pose would be one which inserts parameter dial groups into those actors included in the pose.  Such a pose would be a hack, created manually or derived from an existing file.  Poser will not generate such poses natively.

To make one, open a .cr2 containing parameter groups and delete everything except the version statement and the listings for actors you want to modify.  Delete everything from these actor listings except the groups section in the channels.  Upon applying the pose, the groups present in the pose will replace any existing groups in the appropriate actors.

The point being that such poses seem to overwrite all existing groups, rather than just insert new groups.

Edit: One could ostensibly insert geometry groups into actors, using a pose, and that type of pose could conceivably be discussed as a group injection pose, although these would be more effectively described as geometry insertion poses as they insert a completely new geometry into an actor.  Such poses shouldn't be confused with those I describe above.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.