Edit Membership Tool

You can directly edit deformer set memberships by selecting deformable object points with the Set Membership Tool.
Important: The Edit Membership Tool does not work if your Geometry has component tags. The Edit Membership Tool is now a legacy tool and has been replaced by Component Tags which is now the preferred method. Component Tag-defined deformation membership is backwards compatible with deformer set defined membership so you can use both method in the same deformation chain.

See Editing deformer set membership.