IDT tool - How to create multiple data sources on existing universe ( .unx)

Hello

I have a situation where by we have existing universes (.unv) files of which I have converted one to a .unx via the use of IDT tool.

We now have another datasource that we want to utilise in an existing universe.

I know how to create a new project --> new data Foundation (.dfx) with multiple connection and use this to create a new Business Layer (.blx) file

for a single universe.

However, I want to be able to use an existing universe (.unx) and the .dfx and .blx  and add another connection to the .dfx and add objects to the .blx

I have tried but am exhausted - ANY ONE OUT There know how to do this ?

Thanks in advance.

Sanjay