The Source App
You create the template—actually a set of JSON files—from that source app. If you update the source app in Analytics Studio, you can also update the template. The same template can also be updated by source apps in different orgs. This lets your team work collaboratively on the source app and its template. That is, more than one developer can work on the template, at the same time.

Templates can reuse dashboards, lenses, and datasets that are part of apps other than the source app by creating dependencies on those assets. The reused assets must be part of apps created from templates. See Share CRM Analytics Assets Between Apps.