Hi @stavernia,
Thanks for posting. Not sure if I could get all of details of this one, but still would like to contribute.
When “attach an episode to the sequence attached to the shot”, you are adding a custom entity to the schema, which is doable. According to the preferred way you would like to organize the shots, you are looking for a way to add a nested folder at the root. Not sure If I understand you correctly, but if so, I think the post below will give you some inspiration.
Trying to be helpful and hope it’s not a misleading.
Cheers,
Ben