This is possible using an inbuilt Function CmpUserLevel. Function $$CmpUserLevel returns the security level of the user currently logged in, i.e, either Owner, Data Entry or any other Security Level created by the administrator.
While rendering the User Interface elements viz., Parts, Lines, etc. one can validate the security level using this Function.
For example,
[Part: SecOper]
Option : Operator SecOper : $$CmpUserLevel = "Operator"
[!Part: Operator SecOper]
Add : Lines : Operator SecOper