You can use either a FlowLayout control or simply place some textboxes one under the other.
Is it absolutely critical to have all the data displayed in one row?
Horizontal scrollbars are awful and if you can - it's always to the best to avoid them at all.
As a user I hate it when I must scroll something horizontally. It's unnatural and consumes a lot of time.
Just use this layout:
Code:
Item name:
[____________________]
Item length: Item width:
[__________] [__________]
Extra items (list):
[ Extra item #1 ]
[ Extra item #2 ]
[ Extra item #3 ]
[ Extra item #4 ]
etc