If your product is a standard general product, then all the action takes place in the templates/tpl_product_info_display,php file.
Create an over-ride copy in your templates directory (i.e. templates/YOUR_TEMPLATE_NAME/templates).
Find the section that starts <!--bof Product details list --> (line 116 in 1.3.5)
On the next line delete the section marked in red below> <?php if ( (($flag_show_product_info_model == 1 and $products_model != '') or ($flag_show_product_info_weight == 1 and $products_weight !=0) or ($flag_show_product_info_quantity == 1) or ($flag_show_product_info_manufacturer == 1 and !empty($manufacturers_name))) ) { ?>
Move line 119 to the position in the file where you would like the model data to appear (e.g. line 57) and amend it to read> <?php echo (($flag_show_product_info_model == 1 and $products_model !='') ? '<h2>' . TEXT_PRODUCT_MODEL . $products_model . '</h2>' : '') . "\n"; ?>You may want to tweak the position or the tag used to make it bold. You may even want to add an ID to give you more control over the appearance through CSS, but this gives you the basic idea.
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