If you wish to upgrade to Creative Cloud for teams from individual subscription, you have to purchase the subscription for teams and get the Individual subscription canceled.
Creative cloud for team $69.99(new customers): https://creative.adobe.com/join/team
Creative cloud for team $49.99(Requires prior purchase of CS3 or later): https://creative.adobe.com/join/team_offer
For cancellation : Cancel your membership or subscription | Creative Cloud
To manager subscription : Manage your membership and payments | Creative Cloud
Thank you for replying Atul. I'd seen that information. It seems somewhat surprising that you can't expand an individual membership to a team membership but have to cancel one and commence another?
I certainly understand your concern, I would like to inform you that Individual and Teams are two different segments which can not be merged.
However, we have simplified the cancellation procedure for you, please check the link below.
Kindly contact us in case of any trouble via Contact Customer Care