Short answer HubSpot's KB: custom modules change a quote template's appearance, content and logic. You can't add custom coded modules to a quote via the API; API users pick a template that already includes them. 1. In HubSpot The relevant screen in my demo portal. Quote views (1) and statuses (2). 2. Worth knowing The KB has common use cases. 3. Related Quote templates. Sources HubSpot Community question: How to add 1 custom field in Quote template, HubSpot Knowledge Base: Create custom modules for quote templates