The framework for a new national independent tourism office, Visit USA, was presented to the 1,700 delegates at the White House Conference on Tourism in Washington Tuesday. The conference called on Congress to fund the launch of the office with up to $100 million by September 1996. Tourism officials believe an equal amount of co-op dollars will come from the private sector. The public-private partnership will operate with a limited staff that will depend heavily on outside contracts, according to Judson Green, president of Walt Disney Attractions. Ad campaigns would target key foreign markets. Visit USA would replace the U.S. Travel & Tourism Office in the Department of Commerce after this year.