to prepare, to regulate, to hand up
庀 centers on the idea of making something ready or putting it in order: preparing, regulating, or handing something up in a controlled way.
庀 combines 广 (building) with 匕, which may have contributed a phonetic element. The exact historical development is uncertain.
Inside a building (广), a spoon-like tool (匕) is used to prepare and regulate things, handing them up in an orderly fashion.
For ヒ, imagine a person inside the building saying 'he' needs to prepare everything: 'he' -> ヒ.