Apple Final Cut Express HD - Manual (Page 547)

Chapter 37 Sequence to Sequence Editing 547
VII
You open sequence B and add two more clips to the end of it, extending its duration
from 10 to 15 seconds. Once you’ve done this, all of the clips in the parent sequence
that are to the right of the nested sequence B are automatically rippled 5 seconds to
the right to accommodate the lengthening of the nested sequence B.
Important: If you modify a nested sequence duration in a parent sequence, or if you
specifically set In and Out points in a sequence before you nest it into a parent
sequence, the nested sequence may no longer ripple clips in the parent sequence
when you adjust content in the nested sequence.
Editing the Content of One Sequence Into Another
Without Nesting It
Instead of nesting one sequence inside another, you can simply edit the clips of a
sequence into another sequence.
Editing Sequence Content Versus Nesting
To help you understand how it works, suppose Sequence A has the following content
edited into it:
Adding clips to sequence B
ripples the parent sequence.
Sequence A