icon.When you save the project, each drawing (floor plans, facade views, sectional drawings and perspectives) goes into one file, with a .pro file extension.
This project file contains all the information including materials created by the User, object properties, architectural settings, display settings, hatch patterns and line types.
Only those sets are saved in the projects that are used within it.
The 3D database is not saved in the project by default, only upon your request.
2You can save your current projects with their names in the selected directory by File menu - Save project command, or with the Edit toolbar - icon.
Drawings that make up the projects are also listed in the dialog box.
Floor plans are marked with blue, 3D drawings are marked with black, and plot layouts are marked with green.
Renaming
Double click on the selected File name. You can overwrite the pseudo name of the drawing but the File name of the drawing is not changed with this.
State
You can change the state of any drawing.
You can delete any selected drawing in a project or you can turn them off temporarily. Drawing files can have three states: active, not visible and drawings to be deleted from the project.
Active drawing:
An active drawing is displayed on the screen and is part of the project.
Not visible drawing: 
If you turn off the Light bulb icon, the selected drawing will be temporarily invisible, i.e. it will not have a window but it will remain part of the project. If you reload the project later on, the last saved state will be displayed, i.e. only the active drawings will appear. Click on the Light bulb icon in the Save project or Project properties dialog to activate the invisible drawing.
You can also make the drawing invisible if you disable the window of the drawing.
Drawing to be deleted: 
Click on the Sheet icon of any drawing to delete the drawing from the project; this also means that you delete the drawing from the hard disk and so it will not be accessible any more.
!Remember not to delete the floor plan unless you do it for some specific reason.
Save 3D database
It is switched off by default therefore the 3D database is not saved in the project. The 3D model can be created from the floor plan any time.
If we use the 3D solid modeler and we do not save the object in the object library, we need to save the 3D model.
In a case like this the program recognizes that the plan contains 3D elements which have not connection to the plan and when the project is saved the program offers the possibility of saving the 3D model as well.
Exit the program
When you exit the program or load another project, the program displays the Project properties dialog box showing the states of the drawings, and asks for confirmation. At this point you can cancel the deletion of the drawing.
You can select the Quit without save option In this case you are to lose all changes made since the latest save.
Making copies
When the program saves the projects, it also saves the previous status as filename.pr$. This way you can always find a copy of the previous saving. The next saving will overwrite the copies.