There are several options on how to elevate lines at Crossing Lines - which is currently the most efficient?
The answer depends on whether you plan to do one line at a time or a large number at once.
For a large number of lines at once, the best option today is to use the Elevate Lines command and use the Intersecting Line option - that allows you to pick any number of “Intersecting Lines” and any number of “Crossing Lines” and hit apply and all the crossing lines are elevated to the lines that they intersect with. When you are doing more than 1:1 i.e. 3:1 or 1:3 or 3:3 then this is for sure the most efficient method to use today.
If you are doing 1:1 the above still works but that tool was not optimized for pick intersecting line pick crossing line repeat repeat etc. nor does it give you any choice in what elevation to assign at the crossing point. All of the command options that you have as an alternative also have the same issue - that you can either grab an elevation from one of the lines (but that requires an extra step), but if you want to set an elevation other than one of the lines e.g. the mean elevation or always the highest or the Lowest of the two or set a value of your own, and set both the lines to the same elevation at the crossing point - then there is for sure no tool that does that well today.
The video shows you the options that you have today which include
RPS Adjust Linestring Elevation using spot mode
TBC Linestring Editor in Add VPI or Add Elevation to 3D Node Mode
TBC Linestring Editor in Add VPI mode you can select by Crossing Line (this works well but each time you change line it changes mode on you which makes it slower than desired - but for one off edits it works pretty well.
Video shows the options - we are adding this into Smart Edit 3D currently so watch this space for additional improvements here shortly.