Your preparation may already live in a study export, database file, or annotated PGN. Re-entering every move manually adds friction and can lose useful variations. RepertoireLab's import screen accepts standard chess notation or a .pgn file and previews the moves before saving them.
What the current importer supports
PGN file upload, main lines, parenthesized variations, multiple PGN games, and separate import targets for your White or Black repertoire are implemented in the app.