I have chosen thumbnails for my portfolio entries and it works great on the 4 column layout. The issue I am having is when I publish the individual portfolio post, the same thumbnail image is showing up on the entry. Is there a way to eliminate this from happening?
It’s up to you what to display on the portfolio item page. For example, You can create a portfolio Item Page and add image-featured.png as the featured image which will display on the portfolio archive page as a thumbnail in a grid next to the other portfolio item pages. When a visitor clicks on that thumbnail they are taken to the portfolio item page.
So when you build the portfolio item page, after you added image-featured.jpg as featured, you set that porfolio item page (for example) to have no sidebar, then click the advanced layout editor blue button, add a 2/3 and 1/3 column . In the 2/3 column you add the media element ..
Just look here http://i.imgur.com/4jxo7Pa.png
THe point is , you add a media element to the portfolio item page and it will override the featured image. So featured image is only for the thumbnails,