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The dimensionality of matter significantly influences its quantum properties. In two-dimensional (2D) superconducting transition-metal-dichalcogenides (TMDs) with 1H structure, the in-plane critical magnetic field (Hc₂) is substantially larger than the Pauli limit due to the strong Ising spin-orbital coupling. This phenomenon, known as Ising superconductivity, disappears in three-dimension (3D) as the global inversion symmetry restores in the 2H structure. Similarly, a quantum spin liquid state can emerge in the 2D 1T-TaS₂ monolayers but vanishes in the 3D counterpart due to interlayer coupling. Using elastic and meV-resolution inelastic X-ray scattering and quantum transport, we show that the 2D Ising superconductivity and CDW emerge in the 3D bulk materials 4Hb-TaS₂. The 2D nature of star-of-David CDW phase in 1T layer, combined with the 2D Ising superconductivity in 1H layer, provides a foundation for the potential realization of the Z2 quantum spin liquid state in 4Hb-TaS₂. Our findings establish 4Hb-TaS₂ as a promising platform for the exploration of exotic 2D quantum phenomena in 3D quantum heterostructures.