How can I route my trip from Guangzhou to -- Wenzhou, Yiwu, Ningbo and Hangzhou on my way to Shanghai.

You could reach Wenzhou first and then Yiwu, Ningbo, Hangzhou and last Shanghai. From Guangzhou to Wenzhou, Wenzhou to Yiwu and Yiwu to Ningbo, only K trains are available. While there are bullet trains operating on Ningbo-Hangzhou and Hangzhou-Shanghai routes. By buses, it takes longer time.