Hi Inventor passionists, 
  
I would like to use constrains on axis(es), plane(s). For example using coincident button for a line to X axis (to sit the line on that axis). (Or dimension 0mm alternatively.) 
But,... 
the constrain does not recognize axis(es) and plane(s), even I make it/them visible. 
  
Or is any other function button exist to sit a line or origo of a circle on an axis? 
  
And how do I set same height? For example two lines or origo of a circle and a line etc.? 
  
Thanks.