H1B extension Pending, H1 to H4 (change of status) applied and pending too, How to I cancel COS ?

veni

Registered Users (C)
H1B extension is pending. To be on safe-side (i-94 expiring soon), considering possible RFE/H1B extension denial, I applied for Change of status (i-539) to H4, that is pending.

If I get H1B approval? How do I cancel Change of status (h1-h4)
If H1B gets denied can I continue to wait for H4 Change of status response or should I file to cancel H1B petition?
 
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