The database mapping for the dynamic modules is dynamically created for each module. Open Access uses the name of the type and its fields to generated the name of the tables to which the dynamic type maps.
The functionality for mapping the tables is not publicly exposed so, for the moment, there is no way to override it or extend it in a way so that you can map dynamic type to existing tables.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items