progress report
箚 centers on a progress report, a formal written update on work or status.
箚 combines 竹 (bamboo) with 㓣, a component of uncertain origin. The exact historical development is unclear, but the bamboo radical often relates to writing materials in kanji for documents.
Bamboo 竹 was used for writing slips in ancient times, and the lower part 㓣 resembles a knife 刂 cutting a report into shape. Imagine carving a progress report onto bamboo strips.
For トウ, picture a progress report being sent to headquarters: 'to' HQ -> トウ.