Assuming you are already have some experience in the platform, technically you should do this by using a combination of Collection widget (basically an overcharged table, driven by services) and expressions/validators.
You will find in the Help Center the necessary documentation for both these widgets - just search.
But, to get to the point I wanted to raise, the trick though is to really understand what you want to achieve.
If you're thinking of a very complex dynamic application where everything varies, including button positions etc, Mashup Builder is not the tool for this. We aim to accomplish clear use-cases in a low-code environment, with a good amount of complexity, while giving users the chance to build their own widgets for custom capabilities.
So, analyze your requirements first with somebody who has experience with Thingworx, and validate your use-case makes sense to be implemented in Mashup Builder.
Your Customer Success Manager (if one is assigned to your company) or your PTC Sales contact are both good contacts to advise who to contact.
