If you are using two sender jdbc channels one for each table, you should mantain the scenario and add a new branch in fork.
In this new branch you create an operation mapping (with a Message Mapping for example) to adjust Table2 to TableNewDatabase.
The DataType of "TableNewDB" has to be a specific structure. Check it at Document Formats for the Receiver JDBC Adapter - SAP XI: Runtime - SAP Library
So you have to create a send step for TableNewDB and send it through receiver jdbc channel.
for "TableNewDB" you should create a DataType, a MessageType a Service Interface Inbound Async (You can create one sync if you one to check the number of rows inserted) and a Service Interface Abstract Async for the BPM.
Regards