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Amruta ChaudharyAmruta Chaudhary 

How to use permission set instead of profiles for newly created field as security field level ?

VinayVinay (Salesforce Developers) 
Chcek below reference.

https://developer.salesforce.com/docs/atlas.en-us.securityImplGuide.meta/securityImplGuide/users_profiles_fls.htm

Thanks,