Help adding a stock item to a table.

[CPAC]

Hi I'm trying to create a stock list where the operator can add additional items as required. I need the details highlighted in red to be placed in the table below in size order so the 8mm should go between the 5mm and 10mm.

I also require a formula that will select the the dimensions from the description: LD-45-BLK-2000x1000x5mm = 2000*1000*5

I hope this makes sense. Any help would be much appreciated.
Thanks.