Can PowerBI pull from different SAP-BW cubes?

But then I need to build out relationships after reconnecting again from another cube right? and if there is no direct relationship present would it help to build out a single cube with all other cubes and build the report from that cube? Also can you tell me how direct query works in this case? as I know I cannot fetch data from multiple cubes when using direct query unless I reconnect again, and whenver if I try to pull characterstics into the table the visualisation just break, it works fine for 1 characterstics but not for multiple ones.