Unsolved Command to add user to multiple groups

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Is there a command to add user to multiple groups

For example, Mr James is the manager of the marketing and sales departments.
So I need to add him to the Sales group and to the Marketing group as we..
@Don Pezet
#Don Pezet

https://www.howtogeek.com/50787/add-a-user-to-a-group-or-second-group-on-linux/