Defining Profiles and Authorizations 
Maintain both profiles and authorizations from the profile maintenance functions.
Use the default profiles provided by SAP as templates for your own profiles:
Example: Searching for profiles with F
Use a systematic naming convention. You can change the SAP naming convention, for example.
SAP recommends substituting a different character for the underscore found in the second position in SAP profile names. That way, the profile name makes the source of the profile immediately clear.
Example: To create your own profile for customer accounts clerks, you could copy the default profile F_CUSTOMERS to F: CUSTOMERS. Changing only the second character makes the new profile name unique, but you can easily tell where the profile came from.
Delete the authorizations that you do not require by deleting the corresponding lines from the profile.
If you need to change an authorization, first create a copy of it. Delete the original authorization from your profile and insert your copy in its place. Edit the authorization by double-clicking it. Do not edit the original authorization, as your changes may be overwritten when you update your system with a new Release.
You can add new authorizations by selecting them with Add authorization. This function displays authorizations that have already been created according to object class and object.