I will demonstrate new combinatorial techniques on quivers with unitary gauge groups which gauge Sp(n), SO(n), and Sp(n)+1/2F subgroups of Coulomb branch global symmetries. Geometrically, these correspond to performing a hyper-Kähler quotient on the Coulomb branch. The techniques involve a “quiver subtraction” along with changing the graph-type of the end of the quiver to type D, C, or B. Each technique will be illustrated with simple examples.