View certain number of rows in categories

I think I have seen this on theme called gridlock, or maybe it was another theme.
But how do I make so that the categories only view certain number of rows, then it continues on another list

something like this

list 1 | list 2
cat 1 | cat 6
cat 2 | cat 7
cat 3 | cat 8
cat 4 | cat 9
cat 5 | cat 10