Magento grid layout

If you only want the addboxes.phtml to show on the homepage, then you need to add a block in the Design tab of the CMS page. Select CMS |Pages, choose your homepage and then click the Design Tab. In the Layout Update XML, you will need something like:

<reference name="content">
     <block type="core/template" name="homepage.boxes" template="addboxes.phtml" />
</reference>

Depending on the functionality you need in addboxes.phtml, you may need to change the block type. Also check the path to your template file.

Thankyou for your reply,

unfortunately I am not getting any content displayed. I added the following code to my homepage design area under Layout Update XML:

<reference name="content">
     <block type="catalog/addbox" name="catalog.addbox" template="catalog/addbox.phtml" />
</reference>

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Here is a test from addbox.phtml

<div class="thumbnails"><img src="http://placehold.it/220x220"></div>

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Couple of things.

In your XML you are creating a block with a class of catalog/addbox. Unless you've created this class yourself (or downloaded as plugin), it doesn't exist. Looking at the content of your template files you need to set this to core/template as in my previous example.

In your template file, are you sure that is a correct url for an image - http://placehold.it/220x220 doesn't look like an image.

Yes that is just a test image and renders if I create static block and use static HTML.