You can create task templates to create reusable and customizable custom field configurations to reuse for your tasks.
You can create a new task template by clicking on the New Task Template button and then creating a name for the template and adding your desired custom fields.
After creating the task template you can click on the checkbox to the left of the Task Template to set it as the default template if you wish to do so.
When creating a new task you can select a task template under the ‘Task Template’ label to use your template.