After you add target shapes to a blend shape deformer on the base object, you can edit them to create unique shapes and poses.
If you're using multiple target objects to deform the base object, a target shape is automatically created for each target object you picked when you created the blend shape deformer for the base object. When you edit each of the target shapes, you modify the geometry of the corresponding target object.
You can edit the base object or target objects using Sculpting and Transform (Translate, Rotate, and Scale) tools. The differences in the positions of the vertices from the object's base shape to the edited shape (the delta) are stored in this target shape.
There are four special Sculpt Target Tools that you can use to affect only the target shape you're editing (Edit mode), and not the rest of the object: the Smooth Target tool , Clone Target tool , Mask Target tool , and Erase Target tool . For example, you can erase edits from only the current target shape with the Erase Target tool.
Watch this video or follow the steps below to edit target shapes.
To edit a target shape
To solo (display or hide) a target shape or in-between target on the base object
You can also select a blend shape deformer to isolate the effect of all its target shapes with changing their individual visibility states.
To solo a selected target shape's effect, press Alt+click on the little circle, or right-click the selected target shape's name and choose Solo/Unsolo.
Weighting and editing are disabled when the visibility is off.