After Effects Script to create folders and render Compositions.

mkRenderQueue.jsx

// Copyright: Kumaran

function getSelectedComps(){
    var allItems = app.project.items;
    selectedComps = new Array();
    for (var i = allItems.length; i >= 1; i--) {
        eachItem = allItems[i];
        if ((eachItem instanceof CompItem) && eachItem.selected) {
            selectedComps[selectedComps.length] = eachItem;
            //$.writeln(eachItem.name);
            }
        }
    return selectedComps;
    }

function ChangeRenderLocations(renderPath, outputTemplate){
    var newLocation = renderPath;
    var QTtemplate = outputTemplate;
    if (newLocation != null) {
        //app.beginUndoGroup("Change Render Locations");
        if ((app.project != null) && (app.project.items.length >= 1)){
            // Main code goes here.
            var selectedComps = getSelectedComps();
            //alert(selectedComps.length);
            
            for (i=0; i < selectedComps.length; i++){
                //alert (selectedComps[i].name);
                app.project.renderQueue.items.add(selectedComps[i]);
                }
            
            for (i = 1; i <= app.project.renderQueue.numItems; ++i) {
                var curItem = app.project.renderQueue.item(i);
                if (curItem.status == RQItemStatus.QUEUED) {
                    var curOM = curItem.outputModule(1);
                    curOM.applyTemplate(QTtemplate);
                    var oldLocation = curOM.file;
                    var compFolder = new Folder(newLocation.toString() + "/" + selectedComps[i-1].name.toString());
                    compFolder.create();
                    curOM.file = new File(compFolder.toString() + "/" + oldLocation.name);
                    }
                }
            }
        //app.endUndoGroup();
        }
    }

function getOutputTemplates(){
    // Create a dummy Comp
    var dummyComp = app.project.items.addComp("dummyComp", 1920, 1080, 1, 1, 25);
    // Add to Render Queue
    app.project.renderQueue.items.add(dummyComp);
    // Get the set of output module templates
    var OM = app.project.renderQueue.item(1).outputModule(1).templates;
    // Loop through to find dummyComp
    for (i=1; i<=app.project.renderQueue.numItems; ++i){
        var curItem = app.project.renderQueue.item(i);
        if(dummyComp == curItem.comp){
            // remove it
            curItem.remove();
            dummyComp.remove();
            };
        };
    return OM;
    }

function myTool(thisObj){
    function _buildUI(thisObj){
        // Main Panel or Window (depending on Script>Run / ScriptUI Window)
        var win = (thisObj instanceof Panel) ? thisObj 
        : new Window("palette", "Render Location Changer", [340,174,706,380]);
        
        // UI Code Goes Here
        win.renderLocation = win.add('edittext', [14,20,296,42], '');
        win.renderLocation.justify = 'left';
        win.setRenderLocation = win.add('button', [302,19,344,45], 'RL');
        //win.setRenderLocation.onClick = function () {this.parent.close(1);}
        win.setRenderLocation.onClick = function () {
            var newLocation = Folder.selectDialog("Select a render output folder...");
            this.parent.renderLocation.text = newLocation.toString();
            }
        win.addRenderQueue = win.add('button', [204,49,346,75], 'Add to Render Queue');
        win.addRenderQueue.onClick = function () {
            var test = this.parent.outputTemplates.valueOf();
            ChangeRenderLocations(this.parent.renderLocation.text, test.selection);            
            //alert(test.selection);
            }
        win.outputTemplates = win.add('dropdownlist', [14,51,191,73], getOutputTemplates());
        return win
        }
    // Build the UI
    var myUI = _buildUI (thisObj);
    // Check if Window, then show it (required for Script>Run)
    if ((myUI != null) && (myUI instanceof Window)){
        myUI.center();
        myUI.show();
        }
    }

myTool(this);