Hi I am a business development manager who sell interior solutions like window dressing and soft furnishing. During my calls I want to sell any other products unofficially to make extra buck. Please suggest what are th products I can sell in such case.

Find a guy who does interior design or general contracting who you trust, and refer jobs to him under a percentage deal, tell your buyers that you can get them a guy who'll do their kitchen professionally, or anything you think they might be interested in. If they trust what you're selling already, they'll be more trusting of who you refer them to, and you get a cut.