You have to use Menu File > Create Program.
Type the Program name you want in the Program name field, type the freqs you want in the Frequencies field, separated by commas, without spaces, enter the default dwell time, and hit save.
After refreshing the database (Menu Database > Refresh database), the new set will be available.
You can read a complete explanation in the User's guide, Pag. 76 of Spooky2_User's_Guide_20161021.
The new frequency sets are located into your Custom Database, named Custom.csv by default. The main database can't be modified by the user.
This blog shows how to create a customized frequency set:
For more details, please check the link: