Selecting subset body parts isn't necessary if you just want to save the pose as is. Just click ok and the pose will be saved. Selecting subset is necessary for the creation of partial poses.

If you check include morph channels it will save the dial values of any morphs currently present and dialed to values other than 0. Be aware that a pose saved with include morph channels checked applied to another figure will only work properly if those morphs are present in the figure you are applying the pose to. It simply transfers dial values that you saved to like morph dials in a figure. So if you save a pose for V4 with her pregnant morph active at a value of 0.500 and wish to copy that to another version of V4 via pose, the new V4 must have that Pregnant morph dial present for the preset "posed" value to be applied to.

Include Body Transformations checked will apply any transforms of the body actor in the scene. So, if your pose was a flying pose and your figures Body was translated along the Y axis, floating in the air, that translation will be saved with the pose and applied to a figure when the pose is applied.

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