Thanks Gritly. My question is slight different. I have already created the field and was able to add it to the "Full Member" display. 

That "Full View Member" seems to be linked to the "Info" block. Which I have on the "View Profile" page.

So now I want to create a new sub-menu item called "Skills" on the Person's profile -- beside the other menu items -- and have a custom block that only shows the Skills, not any of the other info that is in the "Info" block.