I’m sorry but your answer Adobe is not addressing the problem. “Nesting a sequence” is completely to creating a “sub sequence”. Adobe Premiere Pro lacks the sub-sequence feature that Final Cut Pro and Avid Media Composer have and editors swear by.
Adobe Premiere Pro, as well as Final Cut Pro & Avid Media Composer allows you to create sub-clips: https://library.creativecow.net/devis_andrew/Subclips/1
Adobe Premiere Pro does not allow you to create sub-sequences as explained here: https://www.lynda.com/Final-Cut-Pro-tutorials/Creating-subclips-subsequences/76335/86857-4.html
For Adobe to try and say that yes it does by “nesting” is wrong and misleading.
Nesting is described as: Putting one sequence inside another sequence is called nesting a sequence.
Sub-sequence is describe as: Creating a new independent sequence from an in and out range from an existing sequence.
I hope Adobe Premiere Pro brings this much need feature into its software soon!