The possibility of the existence of a field-induced micro-macrodomain switching was proposed and examined using 9 mol % PbZrO3-doped 0.6Pb(Ni1/3Nb2/3)O3-PbTiO3 (PNN-PT) systems having rhombohedral symmetry at room temperature. the thermally depoled (freshly prepard) specimens prepared from the rhombohedral side of the system exhibited a relaxor behavior for the whole range of temperature examined (for T<Tmax), where its MPB is 6 mol% for PbZrO3. However, a micro-macro ferroelectric domain switching was induced by the aging after prepoling (30 kV/cm) at certain critical temperature below Tmax. Examination of the electric field-induced strain and polarization indicated the existence of a "fuzzy" transition zone under the ac high-field between critical (pseudo-Curie) temperature and Tmax. The observed "fuzzy" characteristics were then correlated with a possible existence of the dynamic field-induced quasimacrodomains below Tmax.odomains below Tmax.