Q:Is it okay to partly cook chicken, then freeze it and finish cooking it later?
A: It's always very risky to partly cook meat or poultry and either refrigerate it or freeze it.
Even in the freezer, the interior of the chicken will cool slowly. When you partly cook it, there's a good chance the interior will get warm enough to allow bacteria to grow but that the chicken won't chill fast enough to stop the number of bacteria from climbing.
When you thaw the meat and complete the cooking, it may be contaminated with enough bacteria to make you sick.