When you first add an expression,
positioning changes to that expression in the score
apply to all parts containing that expression. If an expression
is repositioned in a part, the
change does not affect other instances of that expression in the score
or other parts, and future positioning changes to that expression in the
score do not apply to that part. (An expression assigned to multiple staves with a Score List is treated as a single expression.)
Broken expressions in parts can be relinked
to the score at any time (see Relinking part items to the
score).