The phrase "to handpick a successor" means to carefully select and choose someone to take over a position or role, usually by a person who currently holds that position. Full definition
Ray Ozzie, aka Bill Gates» handpicked successor as Microsoft's chief software architect, has a new start - up. (inc.com)
The reason being is that a watchful eye will give an inside glimpse into the Quinn machine, which is attempting to handpick her successor by paving a route to victory through unfair means for Corey Johnson — a barely qualified candidate with a questionable background. (queens-politics.com)
Cox criticized Cuomo for firing a year ago what he deemed a «qualified Medicaid inspector general» who'd recouped over $ 1.5 billion in wasteful spending, and replacing him with a «handpicked successor urged by the governor to soften the state's tough audits. (rocklandtimes.com)