If you want to create another user with master user and that will create another database schema in running RDS instance . So you may follow the below steps. connect your RDS instance through master password and user ( which is create on RDS creation time) from Bash shell.
# mysql -h <....rds.amazonaws.com> -u linuxpoint -p
now in RDS instance (mysql) shell prompt.
Note: User: awspoint and DatabaseName: linux_point – replace this both with your database name and user name and remove “<>” this.
mysql> CREATE USER '<awspoint>'@'%' IDENTIFIED BY '<password>';
mysql> CREATE DATABASE <linux_point>;
mysql> GRANT ALL PRIVILEGES on <linux_point>.* To <awspoint>@'%';
mysql> GRANT ALL PRIVILEGES ON `<linux_point>`.* TO '<awspoint>'@'%';
mysql> FLUSH PRIVILEGES;
Now you may see your newly created database mysql> SHOW databases;
Now you have to exit this, mysql> \q;
And now you be able to login with new user with new_database
# mysql -h <....rds.amazonaws.com> -u <awspoint> --database <linux_point> -p
mysql>_
And now you be able to restore the dump (from bash shell) in your newly database or you can create tables and all whatever you want with it which will be valid as per requirements.
# mysql -h <....rds.amazonaws.com> -u <awspoint> --database <linux_point> -p < dump.sql