You can sort on the colum values, for sorting the objects in the Designer the answer is No. You needs to sort it manually.
There is a small workaround that, you can put all your class and objects in the Excel sheet and Sort it in the order you want, and use some macro utility avilable in the BOB Download area to design your universe.
The download is avilable in the link.
I never tried this kind of workaround, but you can have a try.
(BOB member since 2006-02-08)