Young Broadcasting, owner of 10 stations nationwide including KRON Channel 4, announced Thursday that it is reducing its work force by 11 percent company wide. Also to cut costs, Young put KRON 4 up for sale last month and it hopes to select a buyer by the end of March. A press release on the budget cuts did not say how many jobs would be eliminated in San Francisco, but the company plans to increase its use of the VJ or video journalist concept where reporters also operate cameras.