Can you create additional subnets in my default VPC, such as private subnets?
Yes. To launch into nondefault subnets, you can target your launches using the console or the --subnet option from the CLI, API, or SDK.

https://www.interviewquestionspdf.com/2017/01/can-you-create-additional-subnets-in-my.html
Yes. To launch into nondefault subnets, you can target your launches using the console or the --subnet option from the CLI, API, or SDK.