Altera Quartus II Scripting - Manual (Page 248)

3–118 Chapter 3: Tcl Packages & Commands
incremental_compilation
Quartus II Scripting Reference Manual © July 2013 Altera Corporation
Example
package require ::quartus::incremental_compilation
project_open my_design
import_partition -partition my_partition -qxp top.qxp
project_close