How to declare a local variable in mule3

Question

I am doing a data transformation in Mule 3. I am updating an existing code where a lot of variables are declared inside the DataWeave 1.0

I want to add a field called "type__c" inside a declared variable.

my input payload is as below

{
  "billofPlaning": {
    "billcollection": {
      "itemDetail": [
        {
          "comm": [
            {
              "commodity": {
                "itemSequence": 1,
                "equipmentPrefix": "ABCD",
                "equipmentNumber": "1234"
              }
            },
             {
              "commodity": {
                "itemSequence": 2,
                "equipmentPrefix": "DEFG",
                "equipmentNumber": "5678"
              }
            }
          ]
        }
      ]
    },
       "equip": [
      {
        "equipment": {
          "prefix": "ABCD",
          "number": "1234",
          "type": 2345
        }
      },
       {
        "equipment": {
          "prefix": "HIJ",
          "number": "7890",
           "type": 234567
        }
      }
    ]
  }
}

My existing DataWeave 1.0 script is this:

%dw 1.0
%output application/java
%var inputData=payload
%var payBill= inputData.billofPlaning.billcollection.itemDetail default [] map (billcode,indexOfbillcode) -> {
    billcode: {
            "field1": "",
            "type__c": ""
        }
---
paybill

I want to reuse the below DataWeave 2.0 code in above DataWeave 1.0 code for the field "type__c".

%dw 2.0
output application/json
var test= ((payload.billofPlaning.equip) filter (($.equipment.prefix == payload.billofPlaning.billcollection.itemDetail.comm[0].commodity.equipmentPrefix[0])
and ($.equipment.number == payload.billofPlaning.billcollection.itemDetail.comm[0].commodity.equipmentNumber[0])))
---
"type__c": test.equipment."type"[0]

Can we do it in some better way using DataWeave 1.0 (basically using any local variable or something inside the payBill variable that we declared in DataWeave 1.0)?