Hi Bruce,
My problem is that I can't see how to define my data structure in the data pad 
JSON data structure 
"ShippingCodes": [
{
  ?code?: ?DHL?,
  ?description?: ?DHL Limited?,
  ?service?: [
    {
      ?code?: ?NEXTDAY?,
      ?type?: ?Next Day?
    }
    {
      ?code?: ?PRE1?,
      ?type?: ?Before 1pm?
    }
    {
      ?code?: ?SAS1?,
      ?type?: ?Slow and Steady?
    }
  ]
}
{
  ?code?: ?RM?,
  ?description?: ?Royal Mail?,
  ?service?: [
    {
      ?code?: ?FIRST?,
      ?type?: ?Standard First Class?
    }
    {
      ?code?: ?PRIORTY?,
      ?type?: ?Priority Next Day?
    }    
  ]
}
]
So I need a Queue referenced within a Queue, which I can't work out a way of doing in the data pad, although I can do it in code:
shippingCodesQueue  QUEUE,TYPE
code                         STRING(20)								!Shipping Code
description                STRING(100)								!Shipping Code Description
services         		&serviceListType						        !Related Services
					END
!Service list Structure
serviceListType        QUEUE,TYPE
code                       STRING(20)							!Shipping Service Code
description              STRING(100)						!Shipping Service Description
					END
Is there some trick or work around to define the above in the data pad?