If you omit the USING block on the TS definition, the default storage group of the database will be used (assuming it exists in the database definition). I am not 100% sure, but I believe that if you omit the STOGROUP on the TS definition, you must also omit the other parts of the USING block and you will get the default PRIQTY and SECQTY allocations (12K for a 4K page size).