Copy job (Preview) needs to support EXISTING Warehouse(s) as valid destinations

I am trying out the new Copy job (Preview). I created a new Warehouse in my workspace to hold the incoming data. But when I go to select that Warehouse in the Copy job wizard, it a) makes me type in a name, then b) tells me "Duplicate artifact name". It does not do a validated list of available options.

Please add the functionality like you have in Data Flows where you can:

1) cross over into other Workspaces

2) pick destination container from what already exists.