Split an array into subarrays programmatically

Hi,

I have an array of data which I want to break down into 8 sub-arrays by value in the first column.

1. I initially remove the empty rows

2. I build a new array using a conditional for loop which holds the ID and the rows of interest.

3. I insert the ID over the redundant first column.

I would like to break 'output' into sub-arrays by value. I'm expecting to have 8 sub-arrays of @ 50-60 rows at the end. Any extra rows that don't fall into these sequences need to be removed. 

What's the best way to approach this? Code and screenshot attached.

Thanks,

J

How should I approach this?