Dimensioning to a quadrant in .idw

[JoelCool]

Hi all, I'm new.

I've designed an spherical radius into a axially symetric part. I need to dimension the center of my spherical radius in a full section view, but Inventor won't let me pick it. Is there a clean way to do this?

Thanks!

 

[JoelCool]

Never mind. I drew a construction line in the sketch from the center point to where I wanted to add my dimension.