I’m with DR on this, but do it a little differently;
You will need; two nucs (min five frames) c/w frames and foundation, as many mini-nucs as you wish to breed queens and a queen clip.
In spring as they build up on (or hopefully before) the Oil Seed Rape give your strongest (and nicest) hive only one super, they will soon outgrow it and make preparations to swarm.
As soon as you see the first cells with a larvae and jelly find the queen and catch her in the clip, keep the frame she’s on to one side.
Take all the other frames and spilt them between the two nucs, making sure both have viable queen cells, food, lots of bees and brood.
Move the nucs to another part of the apiary (min 20 feet away but more if you can).
Take the queens frame and remove any and all queen cells (or they may still swarm).
Put the queen back on her frame, in her original hive in its original location, with the foundation frames round the queens one, put the super back on top.
You now have three colonies, the two nucs and the queen with her artificial swarm (all the older bees that will all go home now).
If your nucs were short of bees when you made them up then shake extras out of the supers (but you most likely won’t have to do this).
Keep and eye on your nucs and as soon as you see sealed queen cells then get bees from your other colony (the three you have made up don’t want to be weakened in any way if you can help it) and make up the mini-nucs with a cup full of bees, don’t be too greedy or they’ll leave as soon as the queen hatches. Put a sealed queen cell out of you nucs in each and move the mini-nucs away as far as you can (put them in the shade, they don't want sun at any time of day) , and feed them candy (constantly).
Now go through your nucs and get rid of all but one good queen cell.
Except for feeding if needs be, leave them all well alone for two weeks then check to see who’s laying and who’s not, don’t worry about those that are not laying chances are they will start soon but it may be time to start thinking about what you are going to do if they don’t……..