Create new app with certain template

I would like to have the option to create an application that will have the same template (that is, every time I create an application, an application will open for me with certain things and not an empty application) or to have an option inside the application to load a certain application (which is not an iframe and can be edited)
Is there such a thing in retool?

You can start with a template and then copy it and add it to your workspace. Use the copy to build application 1 and then go back to the original template and copy it and build application 2 (Assuming here that you only want components and a layout as bases for future applications.)
You can also use Themes to apply colors and other styles to each application if needed or the same for all.) Try reading through this