When you upgrade to VectorWorks 12, especially if you are upgrading from a older version of VectorWorks (pre-11). One of the major changes that we have been using since VectorWorks 11 is viewports. Viewports are really powerful and will change (should change) the way you draw and set up your drawings. For example, before we had viewports we used to need to use layers with different scales to show the same information at different scales, now with viewports you can draw the information once and use two viewports at different scales on the same drawing. You can have different class settings on each viewport, something that was impossible without viewports.
It’s a bit hard to explain the implications of using ViewPorts in this blog, but if you are upgrading look for a good manual that will explain these new concepts to you. I have had some clients recently that upgraded from VectorWorks 9 to VectorWorks 12 and we discussed how they need to review my Essential manual so that they can get a grasp on the new concepts in VectorWorks 12.