印度采购需求：办公椅，办公桌，办公沙发，文件柜，学校家具，培训家具

I'm looking for a versatile sofa bed that can seamlessly fit into various living spaces. It should be stylish yet functional, providing comfort for both sitting and sleeping. Ideally, it would have a modern design with durable upholstery and easy-to-use mechanisms for converting between sofa and bed. Additionally, it would be great if you could provide options for different colors and sizes. I'd also like to know more about the price range, available materials, and lead times for delivery. Looking forward to your prompt response with detailed info!