Object Merge SOP
The Object Merge SOP allows you to merge the geometry of several SOPs spanning different components.
/sop[1-10] - Each source allows you to specify a pattern of SOP paths. The geometry of each SOP is merged into this SOP. Each SOP can reside in a different component. A pattern can be a complete path to a single SOP or it may consist of wildcards, etc.
/xform - Specify a geometry component to which all the merged geometry should be transformed relative to.