selectNestedLayers ();

function selectNestedLayers(){
    // =======================================================
    var idMk = charIDToTypeID( "Mk  " );
        var desc2729 = new ActionDescriptor();
        var idnull = charIDToTypeID( "null" );
            var ref913 = new ActionReference();
            var idlayerSection = stringIDToTypeID( "layerSection" );
            ref913.putClass( idlayerSection );
        desc2729.putReference( idnull, ref913 );
        var idFrom = charIDToTypeID( "From" );
            var ref914 = new ActionReference();
            var idLyr = charIDToTypeID( "Lyr " );
            var idOrdn = charIDToTypeID( "Ordn" );
            var idTrgt = charIDToTypeID( "Trgt" );
            ref914.putEnumerated( idLyr, idOrdn, idTrgt );
        desc2729.putReference( idFrom, ref914 );
        var idlayerSectionStart = stringIDToTypeID( "layerSectionStart" );
        desc2729.putInteger( idlayerSectionStart, 93 );
        var idlayerSectionEnd = stringIDToTypeID( "layerSectionEnd" );
        desc2729.putInteger( idlayerSectionEnd, 94 );
        var idNm = charIDToTypeID( "Nm  " );
        desc2729.putString( idNm, """Group 1""" );
    executeAction( idMk, desc2729, DialogModes.NO );

    // =======================================================
    var idungroupLayersEvent = stringIDToTypeID( "ungroupLayersEvent" );
        var desc2730 = new ActionDescriptor();
        var idnull = charIDToTypeID( "null" );
            var ref915 = new ActionReference();
            var idLyr = charIDToTypeID( "Lyr " );
            var idOrdn = charIDToTypeID( "Ordn" );
            var idTrgt = charIDToTypeID( "Trgt" );
            ref915.putEnumerated( idLyr, idOrdn, idTrgt );
        desc2730.putReference( idnull, ref915 );
    executeAction( idungroupLayersEvent, desc2730, DialogModes.NO );
    //=============================================================

    function getSelectedLayers() { // indexes not ids
        var selectedLayers = [];
        try {
            //var backGroundCounter = activeDocument.artLayers[activeDocument.artLayers.length-1].isBackgroundLayer ? 0 : 1; // didn't worked for artboards
            var backGroundCounter = 1;
            try {
                var dummy = app.activeDocument.backgroundLayer;
                backGroundCounter = 0;
            }
            catch(e){;} //do nothing

            var ref = new ActionReference();
            var keyTargetLayers = app.stringIDToTypeID( 'targetLayers' );
            ref.putProperty( app.charIDToTypeID( 'Prpr' ), keyTargetLayers );
            ref.putEnumerated( app.charIDToTypeID( 'Dcmn' ), app.charIDToTypeID( 'Ordn' ), app.charIDToTypeID( 'Trgt' ) );
            var desc = executeActionGet( ref );
            if ( desc.hasKey( keyTargetLayers ) ) {
                var layersList = desc.getList( keyTargetLayers );
                for ( var j = 0; j < layersList.count; j++) {
                    var listRef = layersList.getReference( j );
                    selectedLayers.push( listRef.getIndex() + backGroundCounter );
                }
                //hasLayerMask = true;
            }
        }catch(e) {
            ; // do nothing
        }
        return selectedLayers;
    }

    var yourLayersIndexes = getSelectedLayers();
}