Hmm, perhaps an automation that'll help you create the subtasks in the tasks table automatically?  I'm curious about your setup though, when faced with this issue I usually just display the timeline from the subtasks table instead:  

Hi Adam–

So I have tasks and some of them have subtasks but not all so as for as I can figure out I can't just point to the subtask table like you're showing in your screenshot.

Ultimately I'm trying to figure out a way to capture tasks AND tasks with subtask in the data to help track and timing and resources per project and individual. Started with the project management template and have been modifying if to what the team needs.

Using the rich text route creates the need for a lot of formula work to extract that info and have it roll correctly.

Having all the tasks on one table MIGHT be the way to go and then link them to the 'parent' task but I'm not sure how that would play out the predecessors. 

Two separate tables seemed to be the right solution but maybe not.