25 Pa. Code § 103.44 – Partial billings.

(a) The local sponsor shall assign a partial billing number when submitting invoices to the Department with a request for reimbursement. The first invoice shall be designated as Partial Billing No. 1, the second as Partial Billing No. 2, and so on.
(b) All items forwarded to the Department with regard to a request for reimbursement shall be submitted in triplicate.

This section cited in 25 Pa. Code § 103.42 (relating to reimbursement to local agency).