There are different subscriptions associated with Dynamics 365. Note this pricing changes often. This is more of a guide on how to manage your subscriptions in the Office 365 portal. Pricing can be found on Microsoft’s website at: https://www.microsoft.com/en-us/dynamics365/pricing
On the website, you will see 2 different tabs for Enterprise Edition and Business Edition. The Enterprise Edition looks like below:
The Business edition consists of:
In the Enterprise edition, under each plan, you can download a PDF licensing guide that contains details on the plan:
The PDF looks like:
You can manage your subscriptions in the Office 365 Admin Portal. Log in to the portal and select Billing->Purchase Services.
Here you will see your current subscriptions and ones available to add:
You can also see the current licenses you have: