There are two advises we can currently give you that might help reduce this effort:
1) You can use the OpenAccess Model Explorer to locate your domain classes easily and you can remove them directly from there by the Delete command in the context menu of each item
2) You can just select only the tables you would like to have while reverse-mapping your database schema to a model initially.
In the Q1 release which will be available next week we are going to provide a new tool which might help you perform such tasks - the Batch Operations dialog. While it will not have a "remove operation" out of the box, you will be able to easily filter and review your classes and you can mark those that should be deleted (for example with an underscore in the beginning). As a result, you can find them faster in the Model Explorer.
Kindly let us know if we can be of any further assistance in your OpenAccess ORM evaluation.
the Telerik team
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