Using multiple reference field in a form

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I have a collection targetAudience with a few rows in it.
Another collection Courses with a field courseTargetAudience - multiple referencing the 1st collection.

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I have a form for entering new courses into the Courses collection. I would like to be able to enter multiple options into the target audience field, like Advanced , Women . How can I add an input for the courseTargetAudience field?

I tried tags, checkbox, and dropdowns, connecting to courseTargetAudience, but none of them really worked.