Is it possible to create a Custom content type declaratively using features in 12 hive that inherits from a custom content type that was created through UI. For example, CT-A is created through SharePoint UI, CT-B is a child of CT-A but can I create it using xml. I would create an ID for CT-B as : "Id of CT-A + 00 + GUID" to signify that it inherits from CT-A. I can get the id of CT-A from the URL string when I go to edit content type CT-A.
Is that possible? I have tried it multiple times but I can't see/use the content type CT-B after activating the feature. The CT-B is in the _cts folder and in the database but I can't get to it. I didn't hide it but there is no way I can get to it. When I go to manage a content type and replace the URL part with the id of CT-B it gives me error. Object reference not set.
Is it at all possible to create a content type using feature xml that inherits a UI defined content type in MOSS 2007??