[HELP] WinRAR Compression Profile

Let me quote official WinRar help file for you
(Chapter - Configuration settings, Article - Compression profiles):

WinRar Help said:

...There are two ways to create a new profile. You may open "Archive name and parameters" dialog, set the desired options, press the button "Profiles" and select the menu item "Save current settings to a new profile". The Profile parameters dialog which appears contains the profile name field, where you should enter a name of the new profile. A few profile options are also available in this dialog. The most important option is "Set profile as default". If you set it, the profile will be automatically selected before every archiving and some archive modification operations. Other options allow to save archive and file names, create a shortcut on Desktop and immediately run archiving after selecting a profile. Read the description of the Profile parameters dialog for detailed information about these options.

Another method of creating a new profile is to press the "Create default" button in the Compression settings dialog. In this case you only need to set the desired archiving options in the dialog which appears and press the "OK" button. The new profile created by this method becomes the default profile with the name "Default Profile". Unlike the first, this method does not provide access to advanced profile parameters such as storing archive and file names or creating a shortcut and it is convenient to create the default profile without additional questions. But if you need more flexibility, use the first method...