>When making new splits, is it better to move them to a new yard or leave in the yard with the original hive,
You will have less drifting if you do. It's not necessarily "better". it's more work. I've never done it. I make my splits right next to the original hive.
>if you do need to move them day?
If you insist, then move them right after you split them. If you wait the drifting will already have taken place.
>or come back that night?
There will be no point then.
>I made a few splits and left them in the same yard, about 15 ft from the original hive, looks like quite a few bees left to return back, I had shakin in all the bees off the cover and 3 extra frames.
Basically you need to shake bees in until the split has twice as many bees as you want it to have. About half will return to the old hive. Or don't have a hive at the old location. That way they can't drift back to it.
Set two bottom boards on each side of the original hive facing the sides of the original hive. Split the hive onto the two bottom boards. Remove the old bottom board. They can't drift back to the original location because there is no hive there...