How to save line studies

In the lowest right hand corner of the screen is the 'choose security ' box. Make sure you have the 'keep line studies' feature checked.  Also, consider setting up your line studies as a template.  To do this, spend as much time as you need to make your chart exactly the way you want it to be. Then, right-click on it and select "save as default template".  It will ask if you want to replace the existing template.  Click on yes. From now on your line studies will appear on new charts.