In service cloud we created different lightning page layouts for different record types and assigned accordingly. For reference see in the attachment.
I have same requirements for the community. How can we assign different lighting page layout for different record types from the community builder?
In a page layout on the field properties you can set the permission to read only.
However there may be fields that you cannot do this with, e.g Account name on the Account object and for those you would need to set the permissions using Field Level Security on the Profile.
Then using Record Type assignment of page layouts you can make the fields editable on one record type only.
Best Answer
You will need to use Page Variation in Community. Audience Targeting feature in Community lets you to assign a Community Page based on certain conditions.
This feature lets you define criteria based on the following attributes: