LONDON (Reuters) - Morrisons , Britain's No. 4 supermarket group, plans to cut 3,000 management jobs as part of a major restructuring of its workforce that will see 7,000 store jobs created, it said on Thursday."The (net) increase of more than 4,000 jobs is after a number of managerial roles are removed," the Bradford, northern England, based grocer said.Jobs created would include skilled butchers, bakers, fishmongers and other fresh food specialists.Shares in Morrisons were down 1% at 1209..