Hide Activity

Hello All,

A Native Primavera file need to be issued to Client but in that there are many activity which I do not want to show and the same havent been shown in the PDF file.

But can the Client see the hidden activity if it is unfiltered or by looking at the relationship of activities ?

Is there any way to hide activities which cant be seen even if you unfilter or trace the logic.

Thanks

Jithin