Will I have to add nest box?

[carlshave]

Hello I have most of my breeding pairs in there cages now so was wondering the birds I have left I wud like to breed them iswell but pick there own partners if u know wot I mean so was wondering the spare birds are in a big cage will they pair up there selfs or will I have to add nest box to get them interested and once paired up move them into cage is that ok or not Any help is great