How to Succeed in Business Without Really Trying (1967)

J. Pierpont Finch, a young but bright window-cleaner buys a book - "How To Succeed In Business" and following its advice joins the multi-national but poorly-connected "World-Wide Wicket Company". Starting from the mail-room he rises to Vice-President in Charge Of Advertising using sneaky and dubious ways so that the person above him gets either fired or moved to another section of the company...