The Target Set creation is part of running a reference pattern where the set of targets for the reference is created.

More on running reference patterns can be seen here:

8.0.x:  CMS - Dependencies - Rules tab 

Select the log lines that you are interested in from the list below

CAST-MS log file

Section of CAST-MS log file dealing with Create Target Set steps are shown in the logs below. 

Starting Create Target Set 

INF: 2016-09-13 16:34:54:              starting Task Create  target set for My Reference Pattern

INF: 2016-09-13 16:34:54:              Task message: Number of objects selected : 8867

INF: 2016-09-13 16:34:54:              No associated log file

INF: 2016-09-13 16:34:54:              ending Task Create  target set for My Reference Pattern