Workflow + form to create task and subtasks for dropdown items

Projects should be created via a form submission, or by a new “task/project” being manually added to a board.

I am trying to create a single board for projects that have multiple deliverables. I use a dropdown menu in the project that could be (Brochure, IFU, Movie, Email, etc). Each deliverable needs to be assigned to a different person, and have different subtasks.

I there a way to make a workflow that can create a project with subtasks on a board whether submitted by a form or manually entered – with multiple types of deliverables being requested?

I can create a form submission and workflow for ONE deliverable but if there are TW