RezTailor is a great way to create customizable documents. It is designed for resumes but can easily be adapted for grocery lists, thank you letters, etc.
With RezTailor, you can create multiple versions of a document. Each version has access to all of the sections from the master document, so you can easily add or remove sections as needed to tailor the document to the current purpose.
I want to create separate documents and save them for later. I want to sign up/in/out and see my previous work. I want to be able to make sections within documents, and sections within sections. I want to create versions of a given document. In a version, I want to pick which sections to hide and which to show.
https://drive.google.com/file/d/1XSwP2yYGuXFIaqff6ncdj5fg4LmUgdpw8w/view?usp=sharing
Document and Section order and drag-and-drop ability. Export to PDF or HTML document. More sophisticated tagging and prioritization of sections.