Group management using csv

Group management using csv

Hello,

Please, could you help me to understand how add and delete groups for users by using csv import.

For example, I need to add group "X" for users A, B, C, D   and delete group "X" for users E, F, G, H .

As I understand I should do it using csv import for user management. 

If yes, what fields should has this csv file.

Thanks in advance,

Zara 

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