Inserting Breaks In Two Sorted Columns

I have been struggling to figure this out for several days now and i don't really know where to go from here.

I have 2 columns and i need to break them up at certain points.

The attached excel file should hopefully be clear enough to show what i mean.
The first tab is how the data starts the second tab is how i want it to look.

To clarify i need to break it after each change in the first column. ie from 1 to 2.

Furthermore, i need to break the "sub groups" the second column up after 15, and 30. I will never have a number larger than 32 in the second column.

I think the excel file will clear up what i mean.

Any help with this would be greatly appreciate.

Thanks!