Refresh schedule data from an external data source

We have an in-house tool that handles a portion of a workflow. It can export task, start date, finish date. Is there a way to import that data and refresh it as part of a larger project in Smartsheet? It could be loaded as a separate sheet, I don't need to retain that once it is loaded in the main project.

Easiest way to conceptualize it is I would like to import a sub-project into a main project pulling in the task name and schedule data.

Thanks in advance!!