Check out this video on Creo Advanced Assembly from PTC Application Engineers
Presenters: Lino Tozzi(Technical Specialist, Fellow) and Ryan Butcher (Technical Specialist, Fellow)
To dive deeper into the subject, check out PTC University.
Webcast Q&A
Question from Carl: Is a skeleton the same as a sketch?
Answer: It is a specific sub-type of a part. Once you create a skeleton part it can contain sketches, Datum features, surfaces, etc. to describe references, locations of the overall design.
Webcast Q&A
Question from J: In top down design, should every subassembly have a skeleton model? Or should you just pull all geometry from the TLA Skeleton?
Answer: Hard to make a sweeping statement there, depends on complexity of the model. Most designs would not require a skeleton in each subassembly, but if it makes sense, no reason not to where appropriate.
Webcast Q&A
Question from Saul: If the skeleton is modified at some point process, do all related components update along with the skeleton?
Answer: Yes, everything related to the skeleton is updated.
Webcast Q&A
Question from Mark: What is the output file format of shrinkwrap? Can I import it to other software packages?
Answer: It is a .prt file. By default it has an "_sw" appended to it's name.