Do you want to be able to inject this morph anytime or just load the figure with your morph already loaded and ready for use?

You can create an INJ file using Poser's File>Export>Morph Injection but first make certain you have Use Binary Morphs in the General>Miscellaneous settings turned on. You'll then be asked which folder in Poses where you want to save the morph INJection.

If you just want to be able to load the figure with your preferred morph, save the figure to a new CR2 and a new name in the character folder, by clicking on the + symbol at the bottom of the character folder and typing a new name.