then you'd be wrong oceans 11 - if you clear an a/c to a point beyond that of one with a level restriction, then it's considered a new clearance and all previous restrictions are cancelled. Do a search on PPRuNe and find the many threads where all the in's and out's of this are explained. Likewise if you clear an a/c to descend FL180 level by say KATHY and then in a later transmission clear the a/c below FL180, say FL130 level GWC, you will need to re-iterate the FL180 by KATHY if you still wanted the a/c to still comply.