How to create separate WWW and NON-WWW Rule for SUBDOMAIN in Nginx?

[mentik_yusmantara]

Help sir...
Currently i use standar approach in custom 4

|*if !SUB|
   #Main Domain WWW & Non-WWW (Not need to change)

|*endif|

|*if SUB="mysub"|
    #Need to separate WWW SUB-DOMAIN
    #Need to separate Non-WWW SUB-DOMAIN

|*endif|

The rule above, created same www and non-www configuration for subdomain
How, to make it separated?