How to get difference of summaries at the dimension level?

[Guruprasad Paduthonse]

Hi,

I need to know if I can use expression to find out difference of summaries at the dimension level?

Eg: I need to know difference of amounts for January and February 

Below is my model. In the model below I would like to know difference of "basiccost_sum" between two months say January and February

{

    "dimensions": [

           {"name":"grinmodified",

  "levels": [

{

"name":"category_name",

"label":"Category name",

"attributes": ["category_name"]

},

{

"name":"country",

"label": "Country",

"attributes":["country"]

},

  {

"name":"item",

"label":"Item",

"attributes": ["item"]

},

  {"name":"month",

"label":"Month",

"attributes":["month"]

  }

  ],

  "hierarchies": [

{

"name":"category_hierarchy",

"label":"Category wise",

"levels":["category_name","item"]

},

{

"name":"country_hierarchy",

"label":"Country wise",

"levels":["item","country"]

},

{

"name":"month_heirarchy",

"label":"Month wise",

"levels":["month","item"]

}

  

  ]

  }

  

 

    ],

    "cubes": [

        {

"name": "grinmodified",

            "dimensions": ["grinmodified"],

            "measures": [

                {"name":"quantity", "label":"Quantity"},

{"name":"landed_cost_inr", "label":"Landed Cost"},

{"name":"basic_cost_inr", "label":"Basic Cost"},

{"name":"tax_inr", "label":"Tax"}

            ],

            "aggregates": [

                    {

                        "name": "quantity_sum",

                        "function": "sum",

                        "measure": "quantity"

                    },

{

                        "name": "lc_sum",

                        "function": "sum",

                        "measure": "landed_cost_inr"

                    },

{

                        "name": "basiccost_sum",

                        "function": "sum",

                        "measure": "basic_cost_inr"

                    },

{

                        "name": "tax_sum",

                        "function": "sum",

                        "measure": "tax_inr"

                    },

{"name":"unit_basic_cost",

"expression": "basiccost_sum / quantity_sum"

},

{"name":"unit_tax_cost",

"expression": "tax_sum / quantity_sum"

},

{"name":"unit_landed_cost",

"expression": "lc_sum / quantity_sum"

}

                ]

        }

    ]

}