You are moving to Plankwork from a spreadsheet or another tool, or you want a board’s tasks in a spreadsheet to share or archive. Plankwork reads and writes one file shape, the Plankwork CSV, so an export can be read back exactly.

Import builds a board’s groups, threads and tasks from a CSV file.
Export writes a board’s tasks to a CSV file.
Conversion help turns a file from another tool into the Plankwork shape with your own AI.

The full chapter, with every step and setting, is in the app: open your account menu and select User manual.