how can we add a blank row to cdt in the interface on buttonaction

Hi, Check the below code.

a!localVariables(
  local!data,
  a!buttonWidget(
    label: "Add",
    saveInto: a!save(
      local!data,
      'type!{urn:com:appian:types}AA_Vehicle'()
    )
  )
)

If in the grid, you can use add row configuration and in that use dynamiclink and append function to append the rows.