Here's what SCID's Edit menu looks like:
Here are the available functions:
Undo - Undoes the last action on game moves or variations, up to the 10 last changes.
Redo - Redoes the last action on game moves or variations, up to the 10 last changes.
Setup Start Board - Sets the starting position for [TheActiveGame].
Copy Position - Copies [TheActivePosition] in FEN to the system clipboard.
Paste Start Board - Sets the start board from the FEN copied to the system clipboard.
Copy Game to Clipboard - Copies [TheActiveGame] to the system clipboard.
Paste Clipboard Text as PGN Game -
Strip - Submenu to delete a range of comments or variations from [TheActiveGame].
Empty Clipbase - Purges [TheClipbase] from any game it temporarily contains. Cannot be undone.
Copy this Game to Clipbase - Copies [TheActiveGame] to [TheClipbase], and the PGN is added to the system clipboard.
Paste Last Clipbase Game - Pastes [TheActiveGame] from [TheClipbase] to [TheActiveDatabase].
Wiki: HowToAnnotateGames
Wiki: Menus
Wiki: TheActiveDatabase
Wiki: TheActiveGame
Wiki: TheActivePosition
Wiki: TheClipbase
Wiki: TrialMode