charge (something) against (something)
To pay for something from a specific account or category of funds. When you're traveling, just charge everything against your company account. A: "Will I get reimbursed if I charge this plane ticket against my personal bank account?" B: "Just charge it against petty cash instead."
charge something against something
to debit or assign the cost of something against something. Can I charge this item against the entertainment account? Don't even try to charge it against your business expenses.