I have the native Zcrm integration with Zcalendar (Sync), but i need some more integration between both.

The stage is this:

At Zoho crm event module, i have the following custom field (pick list):

Field name: Service

Options: service1

Service 2

Service 3

Service 4

At Zcalendar, we have the following calendar

Service 1

Service 2

Service 3

Service 4

I need add events in Zcalendar according to the following criteria:

When a event is created in Zcrm concerning to the service 1, a event is created at zcalendar in the service 1 calendar

Is it possible make it using custom function? Can you give me some reference about the code using custom function?

Thanks and Regards.