Remove Parant Interface IP

Hello,

I would like to remove ethernet0/3 IP - 133.133.233.233 of my running SSG which is running 6.3.0 now

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set interface ethernet0/3 ip 133.133.233.233/28
set interface ethernet0/3 route
set interface ethernet0/3.21 ip 192.168.20.1/24
set interface ethernet0/3.21 nat
set interface ethernet0/3.100 ip 172.16.0.1/29
set interface ethernet0/3.100 route
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also it have some policy related this. Could you please advise.

1) I should remove those related policy first?

2) Is it allow to unset ethernet0/3 IP directly from CLI or GUI?

Thanks!