Not necessary. Here's an alternative that uses derived table (not tested)

SELECT hi_flcode, SUM(hi_amt), ;
		SumWldelvf, SumHddelvf  ;
	FROM hatcinfo ;
	JOIN ( ;
			SELECT lm_flcode, SUM(lm_wldelvf) AS SumWldelvf, ;
					SUM(lm_hddelvf) AS SumHddelvf FROM lotmast ;
				WHERE SUBSTR(lm_flcode,5,4) <= lcFlockNumberEnd  ;
					AND SUBSTR(lm_flcode,5,4) >= lcFlockNumberBegin  ;
				GROUP BY lm_flcode ;	
			) lm ON lm.lm_flcode = hi_flcode ;
	WHERE SUBSTR(hi_flcode,5,4) <= lcFlockNumberEnd  ;
		AND SUBSTR(hi_flcode,5,4) >= lcFlockNumberBegin  ;
	GROUP BY hi_flcode ;
	INTO CURSOR results

>Thanks, Sergey. I guaess that means that I need to execute a subquery for each field I want.
>
>>A subquery in a field list can return only 1 value
>>

...
>>	(SELECT SUM(lm_wldelvf) FROM lotmast ;
>>	WHERE lm_flcode = hi_flcode ) AS sum1,  ;
>>	(SELECT SUM(lm_hddelvf) FROM lotmast ;
>>	WHERE lm_flcode = hi_flcode ) AS Sum2 ;
>>...

>>>