Macbook running Yosemite.

Before learning that the way to add a calendar subscription is by :
File->New Calendar Subscription

I dragged and dropped the ics subscription on top of my iCloud calendar, in the left column of the calendar application that shows all available calendars/subscriptions. When it did that, the subscription was just absorbed by the iCloud calendar and not treated as a separate item within that calendar. Because of that, I can't seem to find and delete the subscription within the iCloud calendar because it is no longer needed.

Since then, all my subscriptions have been added with the :
File->New Calendar Subscription
option and are treated as separate items that can be deselected or deleted.

Is there a way to see subscriptions dropped on top of a calendar?