A quick action on the Account object can be used to create Opportunity records related to an Account. The quick action can pre-populate some fields based on the Account record, and also allow the user to input some fields. This would improve the process of creating Opportunity records

Schema Builder allows users to create custom objects, fields, and relationships using a drag-and-drop interface. However, one of the limitations of Schema Builder is that fields and relationships can be created, but they will be unable to add the fields to the page layout from the canvas. Users will need to go to the Lightning Object Manager or Setup to edit the page layout and add the fields.