Hi,
Please check if below procedure helps in achieving your goal.
Try to use access control policy for domain based restriction.
traditional QoS blades are often used for interface-level shaping. Application/domain-based limiting is best handled through the Application Control policy within the Access Control Policy.
Go to Security Policies > Access Control > Policy.
Create a new rule or edit an existing one.
In the Application/Sites column, add a new Application/Site object.
You can create a custom application group or search for specific URL categories (e.g., streaming sites, social media). To define specific domain names, select Custom Application/Site and enter the domain pattern (e.g., *.example.com).
Configure Traffic Shaping (Limitation)
In the Action column of your rule, select an action that allows traffic (e.g., Accept).
Right-click the Action and select Limit.
Define the maximum bandwidth (e.g., 500 Kbps) allowed for the matching domain/application.
Install the Policy