Family: How do I avoid the lines from crossing?

[Marcus.Isacsson]

Hi fellas!

I guess that this is a simple one, how do I (as easy as possible) avoid the lines from crossing?
Thanks in advance!

[L.Maas]

You have to add more constraints so that it only moves in the direction needed.

Which constraints depend on the behavior you need. An extra reference plane might help. Constraining the line to the crossing of the two reference planes. And using parameters to control the distances

[barthbradley]

Align and Locks the TIPS of the Model Lines.  Tab-Select until you find the blue dot at the line end point. That is the TIP.