Customise Lead Source and Sub Lead Source per webinar

Customise Lead Source and Sub Lead Source per webinar

We have an integration between Zoho Meeting and Zoho CRM. New leads are imported into CRM but now they all have the source "Zoho Webinar".

Can I change this source? Can I add a sub source?

And can I customize these fields per webinar? (So different webinars have a different sub source)