Question
Dimension lines in Creo Parametric 1.0 drawings

As seen in the picture, I am trying to insert some 'construction' lines that show that I am dimensioning from the imaginary intersection of a corner where I have a round placed.
I have tried to put in construction lines from the sketch tab, but they are huge and I can't seem to be able to work with them. Any suggestions?
THe line from the right is my dimension line from my model that shows where the corner would be if the round wasn't there.
Hope this makes the most remote sense. Thanks!
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