Rohit, ADS does not support a Create Table - Add Partition, because it can get very complicated and so we stick with a more standard GUI. We can extract and display the partition information in the Schema Browser for nCluster.

Ivan, we recently added a new node named Partitions for Greenplum (See issue# 9713). Can you extend this to nCluster as well ? 

See attached pic

Partition is supported by NCluster 4.6 or newer versions. Partition hierarchy is presented in ADS' schema browser as:
   Table
      Partitions
         Partitions
            Partitions
               ...
See attached screenshot for more info.
   14.0  - SVN r33642/14.0.0-beta-87
   trunk - SVN r33643/15.0.0-dev-8

Included below are 3 scripts which will create a 1-level, 2-level, 3-level partition hierarchy FYI.

====== Example: 1 level ======

CREATE FACT TABLE "public"."issue_9758_level_1"  (
    "userid"    int NOT NULL,
    "pageid"    int NOT NULL,
    "ts"        timestamp NOT NULL
    )
DISTRIBUTE BY HASH ("userid")
PARTITION BY RANGE(ts) (
   PARTITION clicks_pre_2013( END '2013-01-01'),
   PARTITION clicks_2013_01 ( END '2013-02-01'),
   PARTITION clicks_2013_02 ( END '2013-03-01'),
   PARTITION clicks_2013_03 ( END '2013-04-01'),
   PARTITION clicks_2013_04 ( END '2013-05-01'),
   PARTITION clicks_2013_05 ( END '2013-06-01'),
   PARTITION clicks_2013_06 ( END '2013-07-01'),
   PARTITION clicks_2013_07 ( END '2013-08-01'),
   PARTITION clicks_2013_08 ( END '2013-09-01')
   )
go

====== Example: 2 levels ======

CREATE FACT TABLE "public"."issue_9758_level_2"  (
    "id"       int NOT NULL,
    "country"  varchar NOT NULL,
    "ts"       timestamp NOT NULL
    )
DISTRIBUTE BY HASH ("id")
PARTITION BY RANGE(ts) (
   PARTITION ts_2010 ( END '2011-01-01'
      PARTITION BY LIST ( country ) (
         PARTITION c_na ( VALUES ('usa', 'canada', 'mexico' ) ),
         PARTITION c_eu ( VALUES ('germany', 'spain' ) )
      )
   ),
   PARTITION ts_2011 ( END '2012-01-01'
      PARTITION BY LIST ( country ) (
         PARTITION c_na ( VALUES ('usa', 'canada', 'mexico' ) ),
         PARTITION c_eu ( VALUES ('germany', 'spain' ) )
      )
   ),
   PARTITION ts_2012 ( END '2013-01-01'
      PARTITION BY LIST ( country ) (
         PARTITION c_na ( VALUES ('usa', 'canada', 'mexico' ) ),
         PARTITION c_eu ( VALUES ('germany', 'spain' ) )
      )
   ),
   PARTITION ts_2013 ( END '2014-01-01'
      PARTITION BY LIST ( country ) (
         PARTITION c_na ( VALUES ('usa', 'canada', 'mexico' ) ),
         PARTITION c_eu ( VALUES ('germany', 'spain' ) )
      )
   )
)
go

====== Example: 3 levels ======

CREATE FACT TABLE "public"."issue_9758_level_3"  (
    "id"       int NOT NULL,
    "gid"      int NOT NULL,
    "tid"      varchar NOT NULL,
    "ts"       timestamp NOT NULL
    )
DISTRIBUTE BY HASH ("id")
PARTITION BY RANGE(ts) (
   PARTITION ts_2012 ( END '2013-01-01'
      PARTITION BY RANGE ( gid ) (
         PARTITION group_1 ( START 1 INCLUSIVE END 100 INCLUSIVE COMPRESS HIGH
            PARTITION BY LIST ( tid ) (
               PARTITION type_1 ( VALUES ( 't1', 't11' ) ),
               PARTITION type_2 ( VALUES ( 't2', 't12' ) )
            )
         ),
         PARTITION group_2 ( START 101 INCLUSIVE END 200 INCLUSIVE COMPRESS LOW
            PARTITION BY LIST ( tid ) (
               PARTITION type_1 ( VALUES ( 't1', 't11' ) ),
               PARTITION type_2 ( VALUES ( 't2', 't12' ) )
            )
         )
      )
   ),
   PARTITION ts_2013 ( END '2014-01-01'
      PARTITION BY RANGE ( gid ) (
         PARTITION group_1 ( START 1 INCLUSIVE END 100 INCLUSIVE COMPRESS MEDIUM
            PARTITION BY LIST ( tid ) (
               PARTITION type_1 ( VALUES ( 't1', 't11' ) ),
               PARTITION type_2 ( VALUES ( 't2', 't12' ) )
            )
         ),
         PARTITION group_2 ( START 101 INCLUSIVE END 200 INCLUSIVE NOCOMPRESS
            PARTITION BY LIST ( tid ) (
               PARTITION type_1 ( VALUES ( 't1', 't11' ) ),
               PARTITION type_2 ( VALUES ( 't2', 't12' ) )
            )
         )
      )
   )
)
go
 

Verified in 14.0.0-rc-3