Test Studio allows you to create test scripts from the beginning, using the Recorder. This is an easy way to get started and create a test and is totally codeless. In addition to that, there are multiple configurations that you can apply after recording, such as local or external data.
Once you have created you local data you can bind certain steps to use that data and overwrite the initial recordings. In case you have added an external data source to the project, you need to bind the test to that data, before binding a certain step to use it. I have linked you the documentation for those actions for your convenience.
If you continue to experience any troubles, please zip and attach a sample Test Studio project and I will be happy to assist you further.