H1b to h4 conversion while h1 in administrative processing

I am on h1b visa and went for stamping, its on administrative processing right now and they said they will inform to me when to return passport to consulate.

How can I file H4 based on my husbands approved (already stamped ) ? Do I need to file COS from h1 to h4 or directly apply h4. Does this affect my H1b ?

Directly apply H4, it doesnt hurt your H1B

Thank you… I missed to mention the h1 is not new. She is working on h1 from 4 years.

Is there chance that they ask about h1b( which is in administrative processing ).