[B]=IF(A17="WATER",WATER,IF(A17="SPORT",SPORT,IF(A17="JUICE",JUICE,IF(A17="CSD",CSD,IF(A17="CORDIAL",CORDIAL,IF(A17="CUPS_STRAWS",CUPS_STRAWS,IF(A17="EXCEPTION",EXCEPTION,IF(A17="POSTMIX",POSTMIX,MONSTER))))))))
Where below are categories
Category
WATER
SPORT
JUICE
CSD
CORDIAL
POSTMIX
MONSTER 
CUPS_STRAWS
EXCEPTION
I have column A and B, if I select catehory such as WATER (A17) from drop down list (like above) than it will show me relevent data in column b17 drop down like below
WATER
Cool Ridge 
Cool Ridge Sparkling 500ML
Cool Ridge 600ml 
SPORT
Gatorade 560g x 6 PLASTIC JAR
Gatorade 600ml x 12 PET
And so on[/B]