create a group of contacts and assign them randomly

Hello,

Out of the box, Creatio does not include a process that automatically populates the Assignee group field from a newly created Case. The behavior you described may be implemented through custom logic, such as a business process or script.

However, Creatio also provides an AI-based predictive case routing feature that can automatically suggest or populate the Service and Assignee group fields for new cases. This helps reduce manual effort and ensures accurate team assignment.

You can find more details in the Academy article below:
https://academy.creatio.com/docs/8.x/creatio-apps/products/service-tools/service-cases/service-case-processing/predictive-case-routing

Predictive case routing in the Cases section is an AI tool that helps operators save time during initial case processing and assign the appropriate support team automatically. The model predicts the Service and Assignee group fields in the background upon case registration, based on the email data.
The machine learning model for predicting the assignee group is activated by default but requires training.