Creating Group ID from SUM Limit - forum topic by saraider99

I have a list of products and a count corresponding to the quantity sold in a single table. The data is laid out as such:
Product Name     QTY_SOLD
Mouse                       23
Keyboard                  25
Monitor                     56
TV                             10
Laptop                      45
...
I want to create a group ID where groups are broken up if the sum of the quantity sold is greater than 50.  We can order by Product Name to get an output similar to the following.
Product Name     QTY_SOLD     GROUP_NBR
Keyboard                 25                1
Laptop                     45                1
Monitor                    56                2
Mouse                     23                 3
TV                           10                3
 
I created a case statement to create the output I need but if I want to change the group id cutoff from 50 to say 100 or if i get more products and quantities I have to keep changing the case statement. Is there an easy way to use either recursion or some other method to accomodate this?

UPDATE main
FROM prod_list AS main,
 (
 SEL PROD_NAME
 , QTY_SOLD
 , SUM(QTY_SOLD) OVER (ORDER BY PROD_NAME ROWS UNBOUNDED PRECEDING) RUNNING
 FROM prod_list 
 ) inr
SET GROUP_NBR = 
 CASE
  WHEN RUNNING < 50 THEN 1
  WHEN RUNNING > 50 AND RUNNING < 100 THEN 2
  WHEN RUNNING > 100 AND RUNNING < 150 THEN 3
  WHEN RUNNING > 150 AND RUNNING < 200 THEN 4
  WHEN RUNNING > 200 AND RUNNING < 250 THEN 5
  ELSE 6
 END
WHERE main.PROD_NAME = inr.PROD_NAME
;