Solution
You can use DIAdem to load the CSV files into the Data Portal since any data loaded is inherently mapped onto the TDMS model. To load or read a specific format for example a custom CSV file you need to develop a DataPlugin. This can be done with the Text DataPlugin Wizard in DIAdem, for more complex formats a script is needed. IN order to determine if the specific file format that you are trying to load can be configured with the DataPluging Wizard take a look at the
DIAdem DataPlugin Text and Excel Wizard Requirements.
If the file format complies with the Wizard requirements then you can use the following articles which fo through the steps on how to create the DataPlugin:
If the custom file has a more complex structure you need to create a DataPlugin using a script. The following document has additional resources and examples on how to do it:
Resources for Writing Your Own DataPlugin.