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Project files and project groups
Retro graphics toolkit operates in projects and project groups. Project files are very simple conceptually. They store all data including tiles (both converted and truecolor) palettes plane mapping and so on. I will use the file extension .rgp for project files but you can use whatever you want. Retro Graphics toolkit does not check file extension for project files.
Another cool feature is project groups. A project group is multiple projects in one file. When saving project groups I will use the file extension .rgg for project groups but you can use whatever you want. Retro Graphics toolkit does not check file extension for project groups.
The settings/project tab contains all you need to control you project and to switch what project you are on. To add more projects you simply press Append blank project and it will do just as it said.
You can move the "Current project" slider and press "Delete selected project" to delete the selected project. Also per project you can add text to the project describing it.
The Have (item) check-boxes do exactly what they say. If you check them that means data for that is stored. If unchecked it is ignored.
The share with (item) check-boxes allow part of one project's data to be in another project. When editing the shared data it affects all projects that share it as the data is stored in ram only once. A copy is not made. However if you unchecked share with and it is previously checked the (formally) shared data will be copied into the currently selected project.
You are designing a game. The first project (project 0) contains the title screen the next project in the group contains the first level and so on. The second level takes place at night it uses the same art as the first level but a different palette so you press Share tiles and select project 1.