Sure you can, but why would you?
If you do decide to draft on Sleeperbot, and manage your leagues on another platform (not recommend); you can do so by manually entering the picks into Yahoo! & ESPN or uploading a CSV file.
However, the best option is to continue your league on Sleeperbot, as we offer a modern platform for season-long league as well.
(What it feels like to play on other platforms)