How to cast a CDT into an new local variable, updating a field ?

Hi,

I'm trying to save into a local variable some data retrieved from an ER. But I would need to update some fields before to store it into my new local var.

Is there any way to do it ?

With the code below I can either cast the data, either create a new CDT local var with the new field value, but I did not succeed to do both. 

(as my CDT could contain more than 50 fields I do not want to override all theses 50 fields in the code below).

a!localVariables(
  local!vehicle: rule!TST_GetVehiclesWithFilters(
    id: 1
  ).data,
  
  local!vehicleCast: cast('type!{urn:com:appian:types:tst}TST_Vehicles', local!vehicle),
  local!vehicleUpdate: 'type!{urn:com:appian:types:tst}TST_Vehicles'(
    make: "New Make"
  ),

  {
    local!vehicleCast,
    local!vehicleUpdate
  }
)

Example : my initial data retreived by the ER is :

TST_Vehicles :

• id : 1
• make : "make1"
• model : "model1"
• ...
• ...
• ...
• is_active : true

and I would like my transformed data like this :

TST_Vehicles

• id : 1
• make : "New make"
• model : "model1"
• ...
• ...
• ...
• is_active : true