You can edit the groups you have defined. You can change the name, remove or change entries or delete the entire group.
To edit the group list, select Edit->Groups from the TimeSprite menu.

To rename a group, click on the group to edit the name.
To delete members of a group or a group itself, select the items to be deleted and press the Delete key.
Notifications
You can set a reminder to notify you after you have worked on an activity for a particular time. You will receive the notification after the Notify After interval expires, and it will be repeated every Reminder Interval. Setting these to 0 will disable them.
Wildcards
You can use wildcards to assign window titles to groups. To create a wildcard entry, assign a group as normal in the Time window, then edit the new member of the group. There are 2 different wildcards you can use: