You as an Admin has ability to give permissions to your sub users for actions like Create, Update/Edit and Delete.
If you don't give them permission to create. They can not create or add new account, sale or transaction.
You can allow them or block them anytime you want.
You have full access to your account. But you can limit the access of your sub users to certain parts of accounts
like Ticket, Umrah, Hajj, Services, Reports, Transactions, Ledgers, Accounts etc. You can give them access or not to any of these is up to you.