Now I will keep things easy for understanding. So I don't load the morphs++ or such things. I have only used the Helena matposes and have loaded her body and face injections. Ok, face isn't needed but she then looks so lovely ... :laugh:

Helena is a complete custom morph influencing some parts and is having a central dial in the body section. So it is a Full Body Morph (FBM). You only have to dial in body to have all parts follow. No need to dial something for example in the abdomen actor.

This is Poser 7. So if you dial the body switch to 1 you will see nothing about that in the same abdomen dial. It showing 0 although internally it's also 1.
With Poser 8 you will see this behavior with the double textboxes at the dial. In abdomen you will see one with 1 and the other with 0, meaning 1 dialed by master switch in the body section and 0 dialed in the actual actor. So in total 1. you can dial additional 0.2 in the abdomen and than coming to a total of 1.2 only for the abdomen part there all other parts are only having 1.
This is now in P8 better shown but the same behavior like in P7 or lesser versions.