Yes and No.
The are a few methods to do this in CC3.
While you could ZOOM in, and then use the Copy to Clipboard selecting manually everything in your zoomed view, you WILL find that things that extend OUTSIDE your zoomed view's borders will be copied.
While this is not exactly what you may want, it is then a simple matter in your new document to use the TRIM TO ENTITY option to trim those things extending beyound the border to the border. In the case of Polygons, you will need to explode them and then carefully trim them to the border, and then connect with paths and then MULTIPOLY them back into a single polygon.
The other method is to simple save a ractangular PNG view of the zoomed area, and make a whole new map of that area. I prefer this method because you can then change things up quite a bit.
For instance compare the map of the BC Coast (with particular attention to Vancouver Island Near Victoria) in the first image. Now compare that to a ZOOMED in view of that same area. Notice the coastal detail shows many inlets and islands that was not visiable from the more gross view.