Import NumberSequenceGroupRef value

I want to import number sequence group ref value as highlighted below for that I have added NumberSequenceGroupRef table in standard NumberSequenceGroup entity, but as mentioned below area and reference label  is data method and number sequence code is reference field.
I want to know how I can import group and reference value in one go for different data entities.
 How I can import group and reference value in one go from data import for different data entities?

and how can I get list of all references?

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