  The CPT map allows two states of a quantum field theory to be sewn together
over CPT-conjugate partial Cauchy surfaces $R_1,R_2$ to make a state on a new
spacetime. We study the holographic dual of this operation in the case where
the original states are CPT-conjugate within $R_1,R_2$ to leading order in the
bulk Newton constant $G$, and where the bulk duals are dominated by classical
bulk geometries $g_1,g_2$. For states of fixed area on the $R_1,R_2$
HRT-surfaces, we argue that the bulk geometry $g_1 \# g_2$ dual to the newly
sewn state is given by deleting the entanglement wedges of $R_1,R_2$ from
$g_1,g_2$, gluing the remaining complementary entanglement wedges of ${\bar
R}_1, {\bar R}_2$ together across the HRT surface, and solving the equations of
motion to the past and future. The argument uses the bulk path integral and
assumes it to be dominated by a certain natural saddle. For states where the
HRT area is not fixed, the same bulk cut-and-paste is dual to a modified sewing
that produces a generalization of the canonical purification state
$\sqrt{\rho}$ discussed recently by Dutta and Faulkner. Either form of the
construction can be used to build CFT states dual to bulk geometries associated
with multipartite reflected entropy.
