An example for how a DocType Grid Editor partial view should look with the DTGE: Reusable Content Extension

DocTypeGridEditorReusableContentExample.cshtml

@inherits UmbracoTemplatePage
@{
    // Set a variable to use the default content if no linked content has been selected
    var content = Model.Content;
    
    // Check to see if there's a linked page value
    if(Model.Content.HasProperty("dtgeLinkedId") && Model.Content.HasValue("dtgeLinkedId"))
    {
        // Run the linked page value through Umbraco.TypedContent() to get the IPublishedContent page
        var dtgePage = Umbraco.TypedContent(Model.Content.GetPropertyValue("dtgeLinkedId"));
        // The value shouldn't ever be null, but weird things happen, so let's just make sure
        if(dtgePage != null)
        {
            // Set the content to use the linked page instead of the default DTGE values
            content = dtgePage;
        }
    }
}

@* Now you can do anything you want with any version of the content in your view! *@
@content.GetPropertyValue("propertyExample");