9.4. How Portal Templates Work in Secondary Portals
When a secondary portal is created a /custom_templates folder is created for the portal. Having it's own /custom_templates folder allows the secondary portal to be modified to match the look of an existing website or have a look of it's own.
The location and procedure for editing templates in a secondary portal is the same as the primary portal (information here), the only difference is that the edited templates should be placed in the secondary portals /custom_templates folder instead of the primary portals /custom_templates folder which is in the root HelpSpot directory.
Important to Remember: Secondary portal templates are stored in it's own /custom_templates folder. Any template changes for a secondary portal should be saved to this location.