merging cdt

A foreach and a lookup to the other list should do that. What did you try?

i am looking for suggestions,yet to try.

a!localVariables(
  local!typeA: {
    {key:"100", field1:"test11"},
    {key:"101", field1:"test12"},
  },
  local!typeB: {
    {key:"100", field2:"test21"},
    {key:"101", field2:"test22"},
  },
  a!forEach(
    items: local!typeA,
    expression: a!update(
      fv!item,
      "field2",
      displayvalue(fv!item.key, local!typeB.key, local!typeB.field2, null)
    )
  )
)

Thank you for your reply, but having a doubt  in this code snippet.

a!update(
fv!item,
"field2",
displayvalue(fv!item.key, local!typeB.key, local!typeB.field2, null)
)

if there are more fields  in cdt ,is there any dynamic  way to get each field parameter for eg: "field2" in cdt 

https://docs.appian.com/suite/help/21.4/fnc_informational_a_keys.html

What do you want to achieve? Do you really need to merge that data?

Thank you, this will help.