This is useful if you want to do a quick test or are not connected to your data source. The sample record is created as you replace values in the test case. When you first use a column to replace a test case value, that value is inserted into the table record in the field for that column.
# of rows selected for Table 1 X the # of rows selected for Table 2 X the number of rows for Table 3 ... and so on
For example, if your test case uses 3 tables with 5 rows each, Silk Test Classic will run 125 test cases.