@AliceZen , So if I understand correctly you are selling a new product or feature through cold calling only? Or is the website tracking it too? i.e. They can purchase directly online without talking to a rep.
Campaigns in HubSpot track the effectiveness of an online campaign. If you are cold calling people who weren’t sourced in this way then the campaign would not be totally effective unless they download content or visit the webpage related to the campaign.
If it is a product feature only, then you only need to track the effectiveness of the product itself being sold in your reports over a specified period of time.
I would even suggest a checkbox on the contact, deal or company for your team to check if they are selling the new features. Then you can track which contact deal or company was attracted to the feature or was notified of it. Later you can just hide the field or delete it once the data has been exported.
I hope this helps.