Dimitri, there are different methods to do this. You would essentially need to create a database connection (if you have a DB) or use something like the CSV parser extension to load the csv data into ThingWorx. The database connection can be done in numerous ways as well; depending on your database, through a JDBC extension or through ADO. I would recommend going through the Connecting to External Data Sources tutorial section.
If you have this data in a database already, you can use the method that Aanjan suggests.
If you want it in Thingworx, in Thingworx there are DataTables, they use a DataShape that have a primary key defined for them.
They basically mimic a relational database table. It also comes with all sorts of built-in services to do Add/Query/Delete etc.