Azure AD - Basic question

Hello Experts,

We have an onpremise AD domain with name xyz.com.

So if I understand correct when a subscription is created in Azure, Microsoft will create by default a new Azure AD tenant for this new subscription and I can create additional Azure AD tenent under this.

and than I can sync my On-premise AD accounts to new Azure tenant that I created?

Is this the right way??

Regards, AzureBeginner