Please find the file '~Themes\Smart\Views\Product\ProductTemplate.Grouped.cshtml' and take the code below:
<div class="product-collateral">
<!--associated products-->
<div class="product-variant-list">
@foreach (var variant in Model.AssociatedProducts)
{
<div class="product-variant-line" data-productid="@variant.Id">
@if (!String.IsNullOrWhiteSpace(variant.DefaultPictureModel.ImageUrl))
{
<div class="variant-picture">
.
.
.
@Html.Action("RelatedProducts", "Product", new { productId = Model.Id })
</div>
Place whole block of code in the 'overview' but at the bottom.
<div class="overview">
@Html.Partial("_Discontinued", Model)
<div class="product-name">
<h1 itemprop="name">
@Model.Name
</h1>
.
.
.
Finally you might need to get the 'full-description' and place it over the 'prpoduct-collateral'.
@if (!String.IsNullOrEmpty(Model.FullDescription))
{
<div class="full-description" itemprop="description">
@Html.Raw(Model.FullDescription)
</div>
}
I believe this will help you to achieve what you want to.