The independent control of circularly polarized (CP) terahertz waves is a significant topic in terahertz technology, and metasurfaces offer a convenient solution. This study presents a novel chiral metasurface-based scheme for amplitude and wavefront manipulation of CP terahertz waves, achieving spin-decoupled functionality through a hybrid design combining chiral phase and Pancharatnam-Berry (P-B) phase, while both wave components exhibit a reflection efficiency greater than 70%. Furthermore, by breaking the rotational symmetry of the meta-atoms, the amplitude response of the reflected terahertz wave is modulated, enabling simultaneous control of both wavefront and amplitude. To validate the proposed approach, two proof-of-concept devices-a meta-reflector and a selective absorber-were designed and demonstrated. This strategy provides a new technical pathway and possibilities for multi-dimensional quasi-optical manipulation of terahertz waves.