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:
8.3.x: CMS - Dependencies - Rules tab
Select the log lines that you are interested in from the list below
Excerpt Macro - Logs - Full Analysis Image for 83
CAST-MS-<date>-<time>.log.txt 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: 2018-11-05 16:47:07: starting Task Create target set for ref1
INF: 2018-11-05 16:47:07: Task message: Number of objects selected : 106
INF: 2018-11-05 16:47:07: No associated log file
INF: 2018-11-05 16:47:07: ending Task Create target set for ref1