Enable discount sharing in the billing preferences of the management account's AWS Account Management Console.

Activate discount sharing in the account that owns the Savings Plan, including all associated accounts, via the AWS Account Management Console.

Leverage AWS Resource Access Manager (AWS RAM) to share the Savings Plan from the AWS Organizations management account to other accounts.

Establish a new payer account with an AWS Organizations and extend invitations to other accounts from the management account.

Form an AWS Organizations in the current account with EC2 instances and a Savings Plan, then invite other accounts to join from the management account.