Pankaj:
Welcome to BOB,
As you are new to the board we welcome you, but before posting, I would also suggest you to search in the forum, you’ll find the solutions or threads which has discussed this topic a lot… or topics on the similar issues… In addition to that, we have FAQ’s for each BO Product individually which are made sticky… go through them
Answer to your question, click the link below, which is from the BO Classic FAQ Entry:
https://bobj-board.org/t/15226/2
BO_Chief 
(BOB member since 2004-06-06)