line-item veto

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The power of a government executive, usually a governor, to veto some parts of a bill passed by the legislature while signing other portions into law.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun the power of an executive in government to nullify or cancel specific provisions of a bill, usually budget appropriations, without vetoing the entire legislative package.