I’m assuming this is for BRMS (you didn’t specify)
I would have to know exactly what you are seeing on “display control group entries” screen to be of more help.
In general terms, you will likely see things like
*EXIT – runs an exit program. Press F11 to see the exit command
*SAVSECDTA – Save Security Data – should be user accounts and authorities
*SAVCFG – Saves the configuration (system values, etc)
*ALLUSR – Saves all “user” libraries (Prod and Test)
*IBM – Saves the IBM Libraries
*ALLDLO – Saves document libraries
*LINK – Saves IFS Directories and Files
*SAVSYS – Saves the System
You could also have a specific library name or a “List” name. Lists are defined using option #5 on the Backup Planning menu.
There is actually extensive help text on the edit option for the control groups.