On the "Input" page, you select the type 2 data file(s) containing the data you wish to plot.
If you specify a MIKE 21 result file, you will also be able to plot derived items from the file, e.g. surface elevation.
The "Master File" is the data file covering geographically the outer-most area, i.e. the coarse grid or the main area in nested model terminology.
"Nested Files" is a list of one or more fine grid data files embedded inside the area covered by the "Master File".
Plot of data from the "Nested Files" is positioned relative to the "Master File" data using the geographical information of the data files.