To create an agent type asset:
Select a skeletal mesh or the skeleton asset of your character.
From the Atoms Crowd menu execute the "Create agent type" action.
The action generates two new assets: an atoms variation asset and an atoms agent type asset.
Save the two new assets.
If you want test the agent type asset:
Create a new AtomsAgentGroup actor.
Add a Grid layout behaviour component
Select the grid layout component and on the agentType property set the agent type asset your created
An agent in bind pose should be now visible inside the viewport.
To create an Agent Type manually or for more advanced setup please follow this tutorial: