On the Activities tab, click New.
Select General.Modify config. Enter a unique Name. Leave the other options on this tab at their defaults.
Click on the Time tab.
Select, for instance, "At Midnight" as the Recurring option in the Times box to run the activity every night at midnight. Leave all other options on this tab at their defaults.
Click on the Devices tab.
Select the Devices you want to configure from your CatTools Host.
Click on the Options tab.
Enter your configuration commands in the active config commands field. Leave all other options on this tab at their defaults.
Click the OK button.
NOTE: A simple way to test this activity, and get more used to it yourself, is to do a change of interface description, using the commands in the example above:
int e0
description this is a test
Then try copying it and using a different description, so you can run them in sequence and flip the description back and forth. Then maybe combine it with a Backup.Running config, so you can see the changes in the config files, the email reports it generates, and so on.