Transferring two desktops from two different MacBooks

So my wife and I have historically had our own lap tops but recently got a new MacBook. We are trying to consolidate both of our computers. I initially did a data transfer from my computer and then created a profile for her. The new computer is effectively a clone of my old now. Question ultimately is can a do a second data transfer of my wife's data to the computer as well but onto a second profile. I just don't want to lose all my other data from the previous transfer?The old computers are first or second gen MacBook air's and transferring to a new generation MacBook Air. Much appreciate your help!