How to store selection result in to variable in Oracle procedure

You have a couple options. You could turn that query into a cursor:

DECLARE
     CURSOR v_employeeRecords IS
          SELECT * FROM Employee WHERE Salary > 10;
     v_employeeRecord  employee%ROWTYPE;
BEGIN
     FOR v_employeeRecord IN v_employeeRecords LOOP
          /* Do something with v_employeeRecord */
     END LOOP;
END;

Or, you can create a TABLE variable:

DECLARE
     v_employeeRecord  employee%ROWTYPE;
     v_employeeRecords IS TABLE OF employee%ROWTYPE;
     i BINARY_INTEGER;
BEGIN
 SELECT * BULK COLLECT INTO v_employeeRecords
      FROM Employee WHERE Salary > 10;

 i := v_employeeRecords.FIRST;
 WHILE v_employeeRecords.EXISTS(i) LOOP
     v_employeeRecord := v_employeeRecords(i);
     /* Do something with v_employeeRecord */
     i := v_employeeRecords.NEXT(i);
 END;
END;

I haven't tried these samples in Oracle, so you may get compiler errors...