Editable Grid - Dynamic rows

Let's understand it first. For storing separate values, you need separate variables and a separate index of a variable. 
So you need to make a 2D array here that you can achieve by adding 3 fields in a CDT and using that CDT as the datatype of an array type variable

a!localVariables(
local!tech,
local!count,
local!counts: if(
a!isNullOrEmpty(local!count),
null,
a!forEach(
items: enumerate(local!count) + 1,
expression: {
a!textField(
label: "Text",
labelPosition: "ABOVE",
value: ri!Queries.question,
saveInto: { ri!Queries.question },
refreshAfter: "UNFOCUS",
validations: {}
),
a!textField(
label: "Text",
labelPosition: "ABOVE",
value: ri!answers.option1,
saveInto: { ri!answers.option1 },
refreshAfter: "UNFOCUS",
validations: {}
),
a!dropdownField(
label: "Text",
labelPosition: "ABOVE",
placeholder: "--- Select a Value ---",
choiceLabels: cons!MCS_ANSWERS,
choiceValues: cons!MCS_ANSWERS,
value: ri!answers.correctans,
saveInto: { ri!answers.correctans },
validations: {}
)
}
)
),



a!formLayout(
label: "Questionare",
contents: {
a!columnsLayout(
columns: {
a!columnLayout(
contents: {
a!dropdownField(
label: "Technology",
labelPosition: "JUSTIFIED",
placeholder: "--- Select a Value ---",
choiceLabels: rule!MCS_GetTechnologyName().subname,
choiceValues: rule!MCS_GetTechnologyName().subid,
value: local!tech,
saveInto: {
a!save(local!tech, save!value),
a!save(ri!Queries.subid, local!tech)
},
searchDisplay: "AUTO",
validations: {}
)
}
),
a!columnLayout(
contents: {
a!dropdownField(
label: "Count of Queries",
labelPosition: "JUSTIFIED",
placeholder: "--- Select a Value ---",
choiceLabels: cons!MCS_COUNTOFQUESTIONS,
choiceValues: cons!MCS_COUNTOFQUESTIONS,
value: local!count,
saveInto: local!count,
searchDisplay: "AUTO",
required: true,
validations: {}
)
}
),
a!columnLayout(contents: {})
}
),
a!gridLayout(
label: "Enter Questionnaire ",
labelPosition: "ABOVE",
headerCells: {
a!gridLayoutHeaderCell(label: "Question"),
a!gridLayoutHeaderCell(label: "Option Available"),
a!gridLayoutHeaderCell(label: "Correct Option")
},
columnConfigs: {},
rows: {
a!forEach(
items: local!counts,
expression: a!gridRowLayout(
contents: {
a!textField(
label: "Text",
labelPosition: "ABOVE",
value: fv!item.question,
saveInto: fv!item.question,
refreshAfter: "UNFOCUS",
validations: {}
),
a!textField(
label: "Text",
labelPosition: "ABOVE",
value: fv!item.option1,
saveInto: fv!item.option1,
refreshAfter: "UNFOCUS",
validations: {}
),
a!dropdownField(
label: "Text",
labelPosition: "ABOVE",
placeholder: "--- Select a Value ---",
choiceLabels: cons!MCS_ANSWERS,
choiceValues: cons!MCS_ANSWERS,
value: fv!item.correctans,
saveInto: fv!item.correctans,
validations: {}
)
}
)
)
},
selectionSaveInto: {},
validations: {},
shadeAlternateRows: true
)
},
buttons: a!buttonLayout(
primaryButtons: {
a!buttonWidget(
label: "Submit",
submit: true,
style: "PRIMARY",
loadingIndicator: true
)
},
secondaryButtons: {
a!buttonWidget(
label: "Cancel",
value: true,
saveInto: {},
submit: true,
style: "NORMAL",
validate: false
)
}
)
)
)

Use this feature to make your code more readable.

Could you please try the below code?

a!localVariables(
  local!tech,
  local!count,
  local!counts: a!refreshVariable(
    refreshOnVarChange: local!count,
    value: a!forEach(
      items: if(a!isNullOrEmpty(local!count),null,enumerate(local!count)+1),
      expression: {
        question:"",
        option1:"",
        correctans:""
      }
    )
  ),
  a!formLayout(
    label: "Questionare",
    contents: {
      a!columnsLayout(
        columns: {
          a!columnLayout(
            contents: {
              a!dropdownField(
                label: "Technology",
                labelPosition: "JUSTIFIED",
                placeholder: "--- Select a Value ---",
                choiceLabels: {"Java","Python","Git"},
                choiceValues: {"Java","Python","Git"},
                value: local!tech,
                saveInto: {
                  a!save(local!tech, save!value),
                },
                searchDisplay: "AUTO",
                validations: {}
              )
            }
          ),
          a!columnLayout(
            contents: {
              a!dropdownField(
                label: "Count of Queries",
                labelPosition: "JUSTIFIED",
                placeholder: "--- Select a Value ---",
                choiceLabels: {1,2,3,4,5},
                choiceValues: {1,2,3,4,5},
                value: local!count,
                saveInto: local!count,
                searchDisplay: "AUTO",
                required: true,
                validations: {}
              )
            }
          ),
          a!columnLayout(contents: {})
        }
      ),
      a!gridLayout(
        label: "Enter Questionnaire ",
        labelPosition: "ABOVE",
        headerCells: {
          a!gridLayoutHeaderCell(label: "Question"),
          a!gridLayoutHeaderCell(label: "Option Available"),
          a!gridLayoutHeaderCell(label: "Correct Option")
        },
        columnConfigs: {},
        rows: {
          a!forEach(
            items: local!counts,
            expression: a!gridRowLayout(
              contents: {
                a!textField(
                  label: "Text",
                  labelPosition: "ABOVE",
                  value: fv!item.question,
                  saveInto: fv!item.question,
                  refreshAfter: "UNFOCUS",
                  validations: {}
                ),
                a!textField(
                  label: "Text",
                  labelPosition: "ABOVE",
                  value: fv!item.option1,
                  saveInto: fv!item.option1,
                  refreshAfter: "UNFOCUS",
                  validations: {}
                ),
                a!textField(
                  label: "Text",
                  labelPosition: "ABOVE",
                  placeholder: "--- Select a Value ---",
                  value: fv!item.correctans,
                  saveInto: fv!item.correctans,
                  validations: {}
                )
              }
            )
          )
        },
        selectionSaveInto: {},
        validations: {},
        shadeAlternateRows: true
      )
    },
    buttons: a!buttonLayout(
      primaryButtons: {
        a!buttonWidget(
          label: "Submit",
          submit: true,
          style: "PRIMARY",
          loadingIndicator: true
        )
      },
      secondaryButtons: {
        a!buttonWidget(
          label: "Cancel",
          value: true,
          saveInto: {},
          submit: true,
          style: "NORMAL",
          validate: false
        )
      }
    )
  )
)

Could you please try the below code?

a!localVariables(
  local!tech,
  local!count,
  local!counts: a!refreshVariable(
    refreshOnVarChange: local!count,
    value: a!forEach(
      items: if(a!isNullOrEmpty(local!count),null,enumerate(local!count)+1),
      expression: {
        question:"",
        option1:"",
        correctans:""
      }
    )
  ),
  a!formLayout(
    label: "Questionare",
    contents: {
      a!columnsLayout(
        columns: {
          a!columnLayout(
            contents: {
              a!dropdownField(
                label: "Technology",
                labelPosition: "JUSTIFIED",
                placeholder: "--- Select a Value ---",
                choiceLabels: {"Java","Python","Git"},
                choiceValues: {"Java","Python","Git"},
                value: local!tech,
                saveInto: {
                  a!save(local!tech, save!value),
                },
                searchDisplay: "AUTO",
                validations: {}
              )
            }
          ),
          a!columnLayout(
            contents: {
              a!dropdownField(
                label: "Count of Queries",
                labelPosition: "JUSTIFIED",
                placeholder: "--- Select a Value ---",
                choiceLabels: {1,2,3,4,5},
                choiceValues: {1,2,3,4,5},
                value: local!count,
                saveInto: local!count,
                searchDisplay: "AUTO",
                required: true,
                validations: {}
              )
            }
          ),
          a!columnLayout(contents: {})
        }
      ),
      a!gridLayout(
        label: "Enter Questionnaire ",
        labelPosition: "ABOVE",
        headerCells: {
          a!gridLayoutHeaderCell(label: "Question"),
          a!gridLayoutHeaderCell(label: "Option Available"),
          a!gridLayoutHeaderCell(label: "Correct Option")
        },
        columnConfigs: {},
        rows: {
          a!forEach(
            items: local!counts,
            expression: a!gridRowLayout(
              contents: {
                a!textField(
                  label: "Text",
                  labelPosition: "ABOVE",
                  value: fv!item.question,
                  saveInto: fv!item.question,
                  refreshAfter: "UNFOCUS",
                  validations: {}
                ),
                a!textField(
                  label: "Text",
                  labelPosition: "ABOVE",
                  value: fv!item.option1,
                  saveInto: fv!item.option1,
                  refreshAfter: "UNFOCUS",
                  validations: {}
                ),
                a!textField(
                  label: "Text",
                  labelPosition: "ABOVE",
                  placeholder: "--- Select a Value ---",
                  value: fv!item.correctans,
                  saveInto: fv!item.correctans,
                  validations: {}
                )
              }
            )
          )
        },
        selectionSaveInto: {},
        validations: {},
        shadeAlternateRows: true
      )
    },
    buttons: a!buttonLayout(
      primaryButtons: {
        a!buttonWidget(
          label: "Submit",
          submit: true,
          style: "PRIMARY",
          loadingIndicator: true
        )
      },
      secondaryButtons: {
        a!buttonWidget(
          label: "Cancel",
          value: true,
          saveInto: {},
          submit: true,
          style: "NORMAL",
          validate: false
        )
      }
    )
  )
)

Thanks Deepak gupta