You can copy and paste items, including notes and notations, to other rhythmic positions and staves in different ways.
Prerequisite
If you want to use the mouse, you have enabled mouse editing.
Procedure
Result
The selected notes/items are copied without deleting them from their original positions. By default, any MIDI CC points in the copied range are also pasted.
If you copied dynamics or slurs to other staves at the same rhythmic position, they are automatically linked by default.
When you copy or move chord symbol regions to other staves, the corresponding players are set to show chord symbols.
Tip
You can assign key commands for Duplicate to Staff Above and Duplicate to Staff Below on the Key Commands page in Preferences.