I am trying to dimension a small angle on a neck finish in a solidworks drawing. Our company generally exports to AutoCAD for this so I am somewhat inexperienced creating drawings in Solidworks.

I modeled a part (a threaded neck finish) with an interal draft angle that is very small. From the section view you can see that there is a small straight area then a very slight tapering line below that. When I created the sketch from this I used an angle of 8 seconds (.002222222 deg). Now however when I try to dimension this angle in the part drawing it won't allow. In fact I can't select the line individually (as seen in the screenshot where both lines are highlighted). How can I place a dimension on this angle? I tried drawing a line off to the side with a sharper angle- dimensioning that- then trying to make the lines collinear, but it fails saying the part is overdefined.

Which brings me to another question. How can I dimension this part without receiving "overdefined" notices? I basically just want to dimension this part freely as if it where in AutoCAD (while still having the abiltiy for it to automatically update with changes).

Thanks!