sorry laura meant to add create the viewport from the design layer or layers that you have created the model on....i usually set my dpi on the sheet layer to 300 the one thing that is a bit tricky if once you have all your viewports on the sheet layer if you add any additional classes to the model you need to update the viewports visibilities otherwise when you update the viewports the additional classes will not be added.....caught me out when i was learning the process