How to merge two rows in a grid

can you explain you requirement  with example 

for example I am choosing Australia and Newzeland  in first interface when I click ok second interface will be having grid that displays two rows one for Australia and one for Newzeland but I want to restrict that row to one 

so in one row you need Australia,Newzeland

a!localVariables(
  local!selectedCountrys,
  {
    a!multipleDropdownField(
      label: "Country",
      placeholderLabel: "---select---",
      choiceLabels: {
        "Australia",
        "Newzeland",
        "India"
      },
      choiceValues: {
        "Australia",
        "Newzeland",
        "India"
      },
      value: local!selectedCountrys,
      saveInto: local!selectedCountrys,
      
    ),
    a!gridField(
      label: "Slected Country's",
      labelPosition: "ABOVE",
      data: if(
        or(
          isnull(
            local!selectedCountrys
          ),
          length(
            local!selectedCountrys
          ) = 0
        ),
        {},
        {
          {
            name: tostring(
              local!selectedCountrys
            )
          }
        }
      ),
      columns: {
        a!gridColumn(
          label: "Names",
          sortField: "name",
          value: fv!row.name
        )
      }
    )
  }
)

can you check this code one 

a!localVariables(
  local!selectedCountrys,
  {
    a!multipleDropdownField(
      label: "Country",
      placeholderLabel: "---select---",
      choiceLabels: {
        "Australia",
        "Newzeland",
        "India"
      },
      choiceValues: {
        "Australia",
        "Newzeland",
        "India"
      },
      value: local!selectedCountrys,
      saveInto: local!selectedCountrys,
      
    ),
    a!gridField(
      label: "Slected Country's",
      labelPosition: "ABOVE",
      data: if(
        or(
          isnull(
            local!selectedCountrys
          ),
          length(
            local!selectedCountrys
          ) = 0
        ),
        {},
        {
          {
            name: tostring(
              local!selectedCountrys
            )
          }
        }
      ),
      columns: {
        a!gridColumn(
          label: "Names",
          sortField: "name",
          value: fv!row.name
        )
      }
    )
  }
)

can you check this code one