You can use array ID Expressions, Wild Card ID Expressions, and external subroutine, basic script, and external measurement routine ID Expressions in combination. For example, to refer to the third instance of all features that start with the letters "CIR" in an external measurement routine attached with the ID "BOLTPAT", use the ID expression "BOLTPAT:CIR*[3]".
Also, you can use ID Expressions in regular expressions. Thus, the measured centroid of the above set of features could be assigned to variable with the following expression:
ASSIGN/V1=BOLTPAT:CIR*[3].XYZ
Also, ID Expressions can be used in regular expressions. Thus, the measured centroid of the above set of features could be assigned to variable with the following expression:
ASSIGN/V1=BOLTPAT:CIR*[3].XYZ