Grouping data

[Newbee]

I have the following senerio:

1. bmex
2. cmda
3. foxc
4. bmex
5. ddma
6. dtsa

where 1,2,4 are grouped and 3,5,6.... These patterns will repeat in random
order for 50 lines. I know I can vlookup these items but is there anythine
else that would group them and drop down all of the categories contained?

 

[Max]

Since the grouping's random, how do you expect Excel to know which items
should be grouped?