loading reference data and initial data into HUB from client

Hello Experts,

I would like to know the options for loading the following data from ECC ( client) to MDG hub system.

1. How to load the reference data ( like material group,transportation group etc) from ECC client to MDG ? . What are the options?

2. How to load the initial load master data from ECC to MDG hub . I guess it is done through the File upload option . Does it cover all the master data like customers,vendors and materials. Please advice.

Thanks.