Step 1: Go to Product >> Custom Checkout Fields >> Add Field
You can choose some type: Text, Password, Email, Phone, Textarea, Select
Required: Requied when booking form or request booking form
Enable: Allow display in booking form or request booking form
Step 2: Config Custom Fields Booking per Product
All: Dipslay All custom fields A Part: Only display custom fields in bellow input. You have to insert Name field to bellow input