OpenTunnel Designer Help OpenTunnel Designer Workflows Drawing Workflow Attach TabExternal Database InterfaceConnecting to DatabasesSetting Up the Database InterfaceConnecting to BUDBCTo Connect to a BUDBC Database To Connect to a BUDBC Database Open the Connect to Database dialog ( Drawing > Attach > Database > Connect to Database ). Select the BUDBC tab. Select a BUDBC Provider. Select a Database Source. Click OK.