How to: Create an Analysis Services Project Based on an Existing Analysis Services Database

In SQL Server Data Tools (SSDT), click New Project. In the New Project dialog box, in the Installed Template pane, select Business Intelligence Projects, and then select Analysis Services.

Select “Import from Server” and follow the steps as show in the below screen shots.

Select SSA Server and Database, then click next, new project will be created with existing objects in the SSAS Database.

Cheers!