Let's say you have 10,000 FT of sidewalls for a tent and want to be able to add and charge each sidewall by foot.

First up, when creating your item, name it by the item name and the measurement you'd like to track and charge by. For example, I'd want to charge my clients per foot, so I named the item "Cathedral Sidewalls 1 Ft".

Then, I'd add the number of feet I have in stock for this item. For example, I know I have 10,000 FT in stock.

Finally, I'd add the price I want to charge per day and per foot. I'd charge my clients 2.00/day/foot in this example.