How to copy selections so they go one after another

Hi everyone,

As shown in the picture, I simply want to randomly select rehearsal mark sections and copy them to the track below. It works, but each time I have to manually select those rehearsal mark sections and delete the generated part in the track below before I can get a new set of random rehearsal mark sections.

I want these sections to stack one after another. How can I achieve this? Even if I save the end of the generated section, I have to run the plugin again, which deletes the saved data, and it cannot paste after the already inserted section.

Thank you for your help!

import QtQuick 2.0
import MuseScore 3.0

MuseScore {
menuPath: "Plugins.pluginName"
description: "Description goes here"
version: "1.0"

onRun: {
    var cursor = curScore.newCursor();
    cursor.rewind(2);
    var endTick = cursor.tick;

    var rehearsalTick = [];

    function getRandRange(numOfMarks) {
        var randNum = Math.floor(Math.random() * numOfMarks);

        return { firstBoundry: rehearsalTick[randNum], secondBoundry: rehearsalTick[randNum + 1] };
    }

    cursor.rewind(1);
    var allElements = curScore.selection.elements;

    for (var i = 0; i < allElements.length; i++) {
        if (allElements[i].type === 44) {
            rehearsalTick.push(allElements[i].parent.tick);
        }
    }

    rehearsalTick.push(endTick);

    var finalRange = getRandRange(rehearsalTick.length - 1);

    console.log("first", finalRange.firstBoundry);
    console.log("second", finalRange.secondBoundry);

    curScore.startCmd();
    curScore.selection.selectRange(finalRange.firstBoundry, finalRange.secondBoundry, 0, 0);
    curScore.endCmd();

    cmd("copy");

    cursor.track  = 4;

    curScore.selection.select(cursor.element);
    cmd("paste");
}

}