Todoist allows you to turn a task into a section by adding a semi colon at the end. After doing this it removes the checkbox and you are able to add sub tasks. Todoist also allows you to format text e.g. to make something bold, wrap it in two asterisk. . The problem is that DueFocus does not recognise this formatting for sections or nesting or text formatting.

I have two screenshots of what this looks like in Todoist and then in the Mac desktop app of DueFocus.

Here is a link to the Todoist docs for sections:

Here is a link to the Todoist docs for text formatting: