What does "va'Yafkidehu Al Beiso" entail?
Malbim: Yosef oversaw the expenditures.
Ha'Emek Davar: Yosef was appointed over those who served in his house and over his property.
What does "v'Chol Yesh Lo Nasan b'Yado" include?
Malbim: Normally, one person oversees income, and another, expenditures, due to concern for theft. Potifar appointed Yosef over both expenditures (Beiso) and income and storehouses (v'Chol Yesh Lo). 1
Ha'Emek Davar: It is service of the king incumbent on Potifar, his authority and honor.
The Malbim (verse 8) explains Yosef's words similarly.