Select operations/interfaces to override/implement

[jamessher]

Hi,
When I draw a realisation between a component (probably same for a class - didn't try) and an interface a dialog appears 'Overrides & Implementations'. which provides checkboxes for operations. I want to specify the the component only implements some operations from the interface as part of the realisation relationship, but if I check a box for an operation EA adds the operation to the component which appears to be indicating that the operation is being overridden. So how do I indicate that the operation is not being overridden - rather is being implemented ?
And If I modify the definition of the operation in the interface, eg. add a parameter, this change is not reflected in the operation which was addded to the component ! So this suggests that the operation added to the component no has no relationship with the interface !

What I am trying to do is indicate that a component/class only realises a subset of the operations of an interface, without EA adding operations to the realising component/class. Is this possible ?

Thanks
   James