したが下書shitagaki
1.

A preliminary version of a written work created as practice or for planning before the final piece is composed.

2.

An initial sketch or outline that serves as a foundation for further detailing in artworks or written documents.

3.

A document or manuscript that is not yet finalized, containing initial thoughts or ideas that may still be edited or revised.

Example:

私はスピーチの下書きを書いています。