Data from Request Form on Subtasks

I'm trying to create a custom request that would create a task, and then subtasks of it based on the request. It appears that there is no way to have any of the fields filled out populate the subtask ( though they will on the task itself ). 

I was able to get the date to sync by making it a start-start dependency, but it looks like I might need to create versions of every subtask needed pre populated and manually map each option based on answers . Since there a number of options  I'll need  to build much of the logic into the request form:

for example date and time is part of the copy they'll need for the subtasks - there is one option for each day, so a drop down list:

each one would then map to an associated page of the request form where they choose the time  ( which would then require 48 options per day  (( 24  hours + 24 :30 )..  this would then also lead to more options.

While perhaps overly complicated it seems like it could work - but only on those where I can hardcode the info ahead of time.

ultimately I want to be able to open a task

and then have a subtask for each deliverable  -it would be easy if that info could flow in from the form but it doesn't seem to be possible.

Apologies if this answer is out there, but I can't seem to find it - if anyone knows how to do it, or a potential workaround  it would be much appreciated it.