1. When you open your project, you will directly find the existing tree structure.
2. To update your plan, select the plan to update, then

a. Click the arrow in the “Main Plan” button.

b. Click on "Edit Source Files."

3. To update the plan of your folder, select the folder, and 

a. Click on the arrow in the “main plan” button.

b. Click on "Edit Source Files."

It is possible to reorder the plans by selecting the plan while keeping the mouse click pressed and placing it where we want (V1.5.0)