You can create tasks and sub task using the following actions:
Create Task
Create Sub Task
When using these actions, you will be able to build a task, or task template, that the automation will create when triggered. You'll find the following options in the task template:
Using Custom Field Variables
When creating tasks and sub tasks with Automations, you may need to pass data from certain custom fields to the new task.
This can be accomplished by using the following automation variables:
{triggered.task.custom_field.ID} - Replace with Custom field ID
Passes the value of the custom field from the task that triggered the Rule.
{triggered.parent.task.custom_field.ID} - Replace with Custom field ID
Passes the value of the custom field from the parent of the task that triggered the Rule.
You will find the Custom Field ID in the Custom Fields section in Admin. You have to be a Custom Fields Manager to access this section.
Once you’ve identified the variable and ID that you would like to use, simply enter it in the corresponding field.