Dart - / JavaScript Coding on App & Backend Coding

We have an app and backend which is needs some updates and changes:

The app is used on a tablet and has a backend admin website:

Changes required are - have attached photos of changes also:

Fix checklists (Hot hold and Chill and Weekly Checks) - should be the same as current checklists (opening / closing) and work independently (create in admin backend and feed to tablet). And Need to link new section for Deliverys to the reports system. So all need to be linked / coded to feed into the daily report system on the app/backend also (setting page to control).

Also need the button added to our Allergy check page in Tablet which will display a pdf or jpeg or allergy chart which is uploaded on the Admin Website to be back end coded to work.