Can I have multiple S.T.A.R. accounts that can be accessed using a set of username and password?

Yes. If you already have a S.T.A.R. account, you can login to create new accounts (e.g. joint, company, trust, retirement accounts) that will be automatically linked. You can then access these accounts using one username and password pair and switch between accounts easily. 

Please follow these steps:
1) Login to your S.T.A.R. account.

2) Click on your username at the top right corner of the website.

3) Click on 'Create new account' in the dropdown menu. Follow the subsequent steps to create a new account. This account will be linked to your existing S.T.A.R. account.