I have a wordpress website which is very much Category driven so the sitemap would look like this:

HugeDomains.com - BlueWidget.com is for Sale (Blue Widget)

Where Widgetstore is the product/shop I want to rank and is a category but included in the sitemap so it looks like a page.

I will be adding posts in this category which all show up on the /widgetstore page but also are pages on their own so:

HugeDomains.com - BlueWidget.com is for Sale (Blue Widget)

I will be focussing my seo efforts on HugeDomains.com - BlueWidget.com is for Sale (Blue Widget) so I only want the underlying posts to be seen as content added to the /widgetstore page.

What do I do to make sure Google only indexes the /widgetstore page and does not index the posts added to the category but does crawl the content on them and sees it as content added to the /widgetstore page?

Should I just index them and give them a lower priority in the sitemap?

It might be a bit confusing but its the best way I can explain it