@Jnetwork you can hide a selected object by pressing H. Or alternatively, SHIFT-H to hide everything not selected, and ALT-H to unhide everything that was hidden.
In vertex mode, selected vertices will get hidden instead of objects.
@Zauberin hmmm, looks like they reappear when we don't have the object open in edit mode. and the thing we're making is a different object so that we don't accidentally select part of the wrong thing
@IceWolf someone else answered our question earlier so no big deal
@Zauberin @Jnetwork if you just want to hide part of a mesh you can assign parts you want hidden to a vertex group and use a Mask modifier
If it's rigged you might be able to use the mask modifier on the head bone vertex group that already exists