I am assuming that the x values of your three curve types overlap and that is why you want to plot them separately. One way to do this is to create separate graphs of your data sets. Then you can use the main menu to Graph>Merge Graph Windows. This will overlay all your curves in the same graph. From here you can manipulate how they are oriented using the Merge Graph dialogue box. In the Arrange Settings option if you set the Number of Rows to 1 and the Number of Columns to how ever many curves you are graphing they will appear side by side in the same window with the same Y axis and separate X axes. You can use the Spacing option in the same dialogue to set horizontal space to 0 . If you want to create a frame around your graph, in the same dialogue box use the Arrange Settings option select Show Axes Frames. This will frame every data set and you can just click and delete which ever frame lines you wish to remove. In order to change the colors of the different curves, just double click on them and the Plot Details dialogue box will appear and allow you to do so. I hope this helps! If not you can send your project file to the Tech team at Origin at tech@originlab.com and we will take a look at it.