In the address book you can save your guests one by one, but you can do it also in goups using a .CSV file.
To create a group of guests in your address book you have to click on “Add group”, and create a new empty group, that you will fill with a massive import (.csv file).
Now you have to fill un Excel table with the data of your guests: first_name, last_name, emails, groups, tax_number
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