If you worked in Powershape, then you came from a hybrid system. Creo is a solid modeler, the way it works is a little different from hybrid cad softwares.
Usually if we import a file, the first thing is to check is if it is closed (solid) or open (surfaces/quilts)model . If it is open then, inside IDD we must repair it.
You can use layers to hide/show/isolate datums, curves,surfaces and solids. Just create a layer, add items to it, and then choose what you want to do with it:
Now, this has some limitations: You cannot hide surfaces that belong to a solid model.
Jose