My parents want to sponsor my friend for a work visa. How would they do this?

My parents want to sponsor my friend for a work visa. How would they do this? I looked it up on the USA immigration website but couldn't find anything about sponsoring someone. just obtaining a sponsor.
Update: to elaborate, realized i forgot this, just for the summer season so specifically a hb2 work visa. my parents offered to do this if he does not get into camp america again this year but said i have to get the information on this for them.
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