Multiple source same target in one quote - is there a setting?

Hello there, 

I work on projects where we have multiple source languages to the same target language and vice versa. 

I've seen one of my vendors can do all of this on XTRF in one quote, however I only have the setting of one source to mutiple target (one to many) and not many to one. 

Can anyone help with how we'd customize this please? 

We have a MemoQ integration based on one to many too.