Did any one build Shopping Cart like app with Mendix? Are there any tutorial or examples or helpful resources(like UI or documentation) related to this? Thanks in advance for any help
Take a look at some of the RAD Training modules. There should be a project in there that has something along the lines of what you are looking for.
You could take a look for the Academy area how to work with Mendix. Maybe one of the examples can help you to find a solution.