  Reservoir engineering is a powerful technique to autonomously stabilize a
quantum state. Traditional schemes involving multi-body states typically
function for discrete entangled states. In this work, we enhance the
stabilization capability to a continuous manifold of states with programmable
stabilized state selection using multiple continuous tuning parameters. We
experimentally achieve $84.6\%$ and $82.5\%$ stabilization fidelity for the odd
and even-parity Bell states as two special points in the manifold. We also
perform fast dissipative switching between these opposite parity states within
$1.8\mu s$ and $0.9\mu s$ by sequentially applying different stabilization
drives. Our result is a precursor for new reservoir engineering-based error
correction schemes.
