PRAGUE — AB Barrandov general manager Pavel Prerovsky ankled the firm Tuesday. Prerovsky was the man behind the ouster of previous Barrandov chief Vaclav Marhoul last spring.AB Barrandov functions as the holding company overseeing the film studio and its related activities. Radomir Docekal, G.M. of sister company Barrandov Studio, has been tapped to take Prerovsky’s place. He will likely be asked to continue running the studio as well. A statement issued by AB Barrandov said the move was intended to strengthen the company’s concentration on production services and its participation in film production.