How to generate thousands of entities, each with slightly different attributes, at the same time

Hi, I am very new in using SimuLink and SimEvents.

For my project, I am trying to generate thousands of entities, each with slightly differnt attributes based on a particular probability distribution, at the same time. Then ideally they will go through the same model, of which StateFlow is also used,at the same starting time, and finally they will independently reach different state and generate different outputs based on their respective attributes. My problems include

• how I can generate thousands of entities, each with slightly different attributes, at the same time.
• how these entities can be the input of the same model, but each of them works independently.

Any comments and suggestions are very much appreciated.