S. 4183 amends the Homeland Security Act of 2002 to give U.S. Customs and Border Protection (CBP) greater flexibility in how it organizes and manages customs revenue functions. The bill allows the CBP Commissioner to consolidate, modify, or reorganize these functions, including creating new job positions or adjusting existing ones in consultation with the Office of Personnel Management. The legislation also protects staffing levels by preventing the CBP from reducing staff below what the agency determines is optimal according to its Resource Allocation Model, and it adds National Account Managers and International Trade Analysts to the list of positions that can be adjusted. The bill includes a technical correction to fix a citation error in the existing law and does not specify any new funding or implementation timelines.