Object Merge SOP
The Object Merge SOP allows you to merge the geometry of several SOPs spanning different components. The SOP data will be baked so that all merged SOPs are relative to each other as if they were located using the transforms of the COMPs they originally came from.
Parameters - Object Merge Page
xform - Specify a geometry component to which all the merged geometry should be transformed relative to.
sop1 - 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.