San Francisco-NBC Internet Inc.'s AllBusiness.com unit has signed a deal with Bigvine Inc. to combine their businesses. The merged company will develop b-to-b services for small businesses. Bigvine, San Francisco, which specializes in providing barter services to businesses, will continue operations under the AllBusiness brand. The venture will draw on marketing support from CNBC and NBC, as well as partnership deals with GE Small Business Solutions, Delta Air Lines and Starwood Hotels and Resorts. The deal drives to create a single small-business portal that combines fresh news content and commerce services.