Remove drawed lines with Repeater on ComboBox value changed

This is the code to repeatedly dray lines on increasing the value on a ComboBox. But how can I delete the number of lines on decreasing this value?
main.qml

Code:

---

ComboBox {
                    id: combo
                    editable: false
                    model: ListModel {
                        id: numoflines
                        ListElement { text: "1"; color: "Black" }
                        ListElement { text: "2"; color: "Black" }
                        ListElement { text: "3"; color: "Black" }
                        ListElement { text: "4"; color: "Black" }
                        ListElement { text: "5"; color: "Black" }
                        ListElement { text: "6"; color: "Black" }
                        ListElement { text: "7"; color: "Black" }
                    }
                    onAccepted: {
                        if (combo.find(currentText) === -1) {
                            model.append({text: editText})
                            currentIndex = combo.find(editText)
                        }
                    }
                    onCurrentTextChanged: {
                        Global.numoflines = parseInt(currentIndex) + 1;
                        console.log(Global.numoflines);
                        Qt.createComponent("Analysis.qml").createObject(parent), {x: 100, y: 200};
                    }
                }

---

Analysis.qml:

Code:

---

Rectangle {
        id: base;
        x: 50;
        y: 480;
 
        Column {
            spacing: -12;
 
            Repeater {
                model: Global.numoflines;
                delegate: Rectangle {
                    width: 800;
                    height: 1;
                    //color: "white";
                    border { width: 1; color: "black" }
                    radius: 3;
 
                }
 
            }
 
        }
    }

---

The repeater will always create as many element as its model says.

Since your model is a simple number, just decrement that number.

Cheers,
_

Once some number of lines is drawn, they will not be deleted when a smaller number of lines is given to the model. So how to delete them and start drawing again?

A Repeater that operates on a primitive model, a number or a list, will always recreate the number of delegates for the current model's count.

I.e. if the number changes from 1 to 2, it will delete all delegates and create 2.
If the number changes from 2 to 1, it will delete all delegates and create 1.

In your code the most puzzlng thing is why you create a new additional Analysis component every time the combobox changes.

Cheers,
_

SOLVED. Thank you.