DataMergeStudio is a document-based app: each project you create is its own document, just like a file in any other native Mac app.
Every project is a single document. You can open several at once and work on them side by side, each in its own window – handy when you’re handling more than one job at a time.
Documents are autosaved as you work, so there’s no separate save step to remember. DataMergeStudio keeps the document up to date for you in the background.
You can keep your documents in iCloud so they sync across your Macs, letting you continue a project on another machine. This is entirely optional – store them locally instead if you prefer.
Rename a document whenever you like, straight from the app or in the Finder, without affecting the project inside.
A project can also be bundled into a package, so you can share everything it needs in one go: Packaging a project