I think so... my TA booked me tickets on RJ and QF separately (connecting at BKK). They are on separate PNRs.

I asked her to combine them as I was connecting and they did. The QF PNR now lists all the RJ flights as well (missing things like seating requests).

She apparently had to get both the RJ and the QF people on the phone and conference them, so they could each do what they had to do in their own system, as opposed to doing it herself.

Of course, I then called MA to connect my other two sectors to RJ, but they had a lot of trouble working out what the hell I was after