When manually importing records by selecting this option from the File menu, you select the target table by first navigating to a layout based on that table. So select a layout based on Time Billing Data first, then import the data.
I create an IMPORT layout to be used in Table-View. I have found it makes it easy to visually view the import the raw data. If I need to script a field such as import date, it is easy to do so. And easy to verify scripted data added to the import.