You can connect directly to an existing Microsoft SQL Server Analysis Services database and directly modify objects within that database. When you connect directly to an Analysis Services database, changes to objects occur immediately and no Analysis Services project is created within SQL Server Data Tools (SSDT).
To Connect Directly to an Analysis Services Database by using SQL Server Data Tools
Open SQL Server Data Tools (SSDT).
On the File menu, point to Open and then click Analysis Services Database.
Select Connect to existing database.
Specify the server name and the database name.
You can either type the database name or query the server to view the existing databases on the server.
You can now directly edit any objects within the Analysis Services database.