An app builder wants to create a custom object and 10 fields.

To create a custom object along with multiple fields and relationships efficiently from a single interface, the Schema Builder is the ideal tool:

A. Schema Builder. This graphical tool provides a drag-and-drop interface for creating and modifying objects and fields in Salesforce, allowing for a visual layout of database schema.

Steps to use Schema Builder:

Go to Setup → Schema Builder.

Drag the 'Object' element into the schema area to create a new custom object.

Define the object's properties (e.g., label, API name).

Drag field elements like Text, Number, or Lookup into the object to create fields.

Configure each field's properties according to your requirements.

Connect objects via lookup or master-detail relationships by dragging the relationship fields between them.

Save the layout to create all elements in Salesforce.

For more information, review Salesforce's Schema Builder documentation.