Contour lines from auto cad come in segmented. Lines I draw free hand in sketchup have to be exploded to be smoothed and manipulated. But I can’t find a way to join the segments back together to use them in sandbox. Any tricks for this?
You can weld the segments into a ‘curve’ entity with this plugin.
TIG-weld v2.0 by TIG — SketchUcation PluginStore
Bezier Spline will let you join edges into a polyline (select edges > r-click and choose the appropriate Bezier Spline option) and allow for easy curve modifications with control nodes. (Need to join Sketchucation. Membership is free.)