Secondary story lines can't directly contain other Secondary Storylines, BUT, you can create a Compound Clip from a Secondary StoryLine, which in turn can be turned into yet another Secondary Storline, etc
... what practical use would have such a … weird methodology???
compounds are no replacement for 'tracks' ... *
tags/roles replace tracks.
If you want to create complex compos, why not use AE?
* and not for Multicam … saw just your [url=http://http://www.fcp.co/forum/4-final-cut-pro-x-fcpx/20604-multicam-with-single-camera-multiple-take-shoots]other post[/url] - you make things really complicated by forcing FCPX to your 'habitual' workflows!
My friend (not an experienced user) used 3 levels of nested clips in a short project. Includes several keyframed shape masks and some chroma keying (re-creating the keyboard scene from the movie Big - lighting up the keys when they're stepped on). He misunderstood a suggestion and thought he needed to nest clips to get those effects. It was definitely slowing his system down but he struggled through. Made the mistake of updating FCPX to 10.4.9 in the middle of the project and now it just beachballs as soon as he opens the library and clicks any clip.
He sent me his library to see if I could open it but I get the same issue,
All I'd like to do is get the timeline and lowest level compound clips open to copy them to a new library. I think that's the route to go. Will mean losing some work but I don't see another option.
Any suggestions? Is there any way to do something like this?