Cash Transaction - in Line

I need a Cash Transaction - Inline. I might have 10 or more lines of sale to the same person.
For each line i must insert - Unit Serial No. and VIN No.
Without these i can not sell the units.
The insurance company demand this data for each line.
With the normal Custom Field i can put it at the bottom but cant show for which transaction is the data.
Is there a way to do it inline.

Use a line-item custom field. Read the Guide: Manager Cloud. But you cannot do this for a cash transaction. You will need to use a sales invoice.

Thanks Tut,
This now make it logically to me.