New Crew Member
To add somebody to the crew search for the person's name and select him/her from the drop down list.
If you can't find the person in the list you can create him/her by selecting the last entry.
Next, search for the person's job and select it from the drop down list. Finish by clicking Ok.
You can also assign a crew member to a season and inherit him/her to all episodes. This way you don't have to add the crew member to each episode.
To do so, change to Supernatural > Season 14 (2018-2019) and edit the crew there.
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as Sam Winchester
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as Jack
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as Dean Winchester
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as Max
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as Eliot
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as Sheriff Mason
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as Sara
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as Fitz