Some tempo changes presume a conductor to pause, cut off and bring in again.
The fermata holds a note, rest or measure more than the usual time. Place the fermata over the note, rest or double bar line to be held.
At a fetura the music stops. The conductor signals the stop and brings the musicians in again. A fetura usually follows a fermata (but doesn't have to).
Indicate at what tempo you want the music to resume.
When the passage to follow the fetura is to be played out of tempo by a solo instrument the term Colla voce is used.
When the passage to follow the fetura is to be played out of tempo by the full orchestra or a major part of the orchestra the term Conducted is used.