Dear all,I have some mrsid files I need to work with on Civil 3D (2016).Each mrsid file contains it's georeference and for each image/map I have 2 files.- .sid which is the image/map- .sdw which contains the geolocalization for the imageI was abble to add the mrsid image file onto Civil 3D and already found how to add a coordinate grid using the layer view.(defined coordinate system / add a Reference System on layout view under Layout Tools Menu)The maps have been made using Camacupa Datum and are on 1:100.000 scale. My actual problem:My problem is that I do not need the full map itself. I just need to work with a specific area of the map and want to add the coordinates on this area.I cannot find a way to "cut" or "select" the desired area in order to work with, and add the reference system on this smaller area of the map.I have tried to add new viewports and select only the desired area but on every viewport I create, the full map is shown.Is there anyway I can select just an area of the map to work with under Reference System in order to add the coordinates grid?Thank you very muchPaulo