The steps each individual user needs to do are documented in the "Working With CA Support Guide for enterprise customers and partners"
Requesting CA Site ID access
Your organization may have multiple CA products and users registered under multiple CA Site IDs. You may need to access one of your organization’s additional Site IDs to open a case for a specific product. This will require access to that unique Site ID.
You must know the Site ID, company name, address, country, city and state prior to making a request. A Business Partner ID can be used if you do not know the specific Site ID.
To request access to a Site ID:
1. Log in at support.ca.com.
2. Click My Account from the top of the page, then Profile.
3. Profile page will open with the Support tab visible.
o Select Request Additional Access.
4. Within the Site Access tab, please complete the required fields and click Submit.
o Your request is automatically received by a CA Customer Care representative and your access request is processed if confirmed by your organization. You will receive an email when your request has been processed. It can generally take up to 24 hours to process your request.