How to get to different registration form for two different user groups?

How to get to different registration form for two different user groups?

I would like to create in my site two different communities with different profile pages and the first step is to give them the possibility to register in two different pages.
How can easy do that? (I’ve got developer membership).

Create a field for them to select their profile type. This could be a radio field or a select field for example. Next you'd use CB Conditional to show/hide tabs/fields based off that profile type selection. If you also need to give them a usergroup based off their profile type you'll need to use CB Auto Actions and its Usergroup action acting on the onAfterUserRegistration (frontend registration) trigger by conditioning against your profile type field under the Conditions tab (you'll need 2 of these to assign the 2 profile type usergroups).

Thank you Krileon,
it's working but now I have another problem. I want two groups of users with different ways to register also using for each group a different subscription. How I can do that? Normally adding some plans with Paid subscriptions they're show in the registration page: in fact I need to show them after the selection of the group to access to choose one the plans for that group (different from the other one).

Under the Workflows tab of your plans you can configure conditions for them during registration and for upgrades. You can configure them to condition based off your profile type field so you can have plans specific to a profile type. As for its selection after profile type selection you can adjust its registration tab order within CB > Tab Management. Sounds like you might benefit from using Step by Step registration layout, which you can enable in CB > Configuration > Registration.