Whenever you create a new application we strongly recommend that you create a project file and open the project rather than individual .ui files. Opening a project has the advantage that all the forms you create for the project are available via a single mouse click rather than having to be loaded individually through file open dialogs. An additional benefit of using project files is that they allow you to store all your images in a single file rather than duplicate them in each form in which they appear.
Start Qt Designer if you haven't already. Click File|New Project to invoke the Project Settings dialog. Enter 'multiclip' as the project's name and 'multiclip.pro' as the project's filename, then click OK. The name of the current project is shown in the Files toolbar which is the top left toolbar by default. Once we have a project we can add forms and begin to build our application. (See the section called Customizing Qt Designer in Chapter 7 "Customizing Qt Designer" for information on changing Qt Designer's toolbars and windows to suit your preferences.)