The "Circuit" Field is derived from three separate sources.
1) PLS-CADD > Sections > Electric > Defined Circuits and Phases > Table
2) Primary Circuit Name defined in PRG (Above the PLS-CADD XML File Definition
3) Circuit Column of PRG's Structure Setup
PRG will apply the 'Primary Circuit Name' to all structures by default, but will override the value if one or more 'circuits', as defined in the PLS-CADD Sections > Electric menu, are attached to the structure. PRG reports all extracted circuit names in Structure Setup under the "Circuit" column. At this stage it would be possible to modify each separate value using the table provided, or the 'Edit in Excel' option where you could assign the 'Construction Sketch Location Number'.