Can you create other VPCs and use them in addition to my default VPC?
Yes. To launch an instance into nondefault VPCs you must specify a subnet-ID during instance launch.

https://www.interviewquestionspdf.com/2017/01/can-you-create-other-vpcs-and-use-them.html
Yes. To launch an instance into nondefault VPCs you must specify a subnet-ID during instance launch.