How can I switch to a different cube without losing the existing workspace?

Hi,

Version: BI 4.1 SP6

Database: MS SQL Server 2012

How can I switch to a different cube without losing the existing workspace?

For example, I have two identical cubes (the BAR3 cube was copied to create the BAR3-TEST cube). The workspace was originally built with the BAR3 cube. I would now like the workspace to use the BAR3-TEST cube. However, after I add the BAR3-TEST cube and attempt to remove the BAR3 cube, I get the following message (see screenshot below). If I click [Yes], the BAR3 cube is removed and so is the workspace. I simply want the existing workspace to stay intact, but now use the BAR3-TEST cube. How can this be accomplished?

Thanks,

Michael