Setting Up Item for P-Card Purchases

My customer does not own inventory, but we have a shared install because we use Oracle Purchasing. I have an issue with P-Card Purchases on Work Orders. I need to capture the P-Card amounts on work Orders. I can do this by creating an item in inventory with a value of a dollar and then adjusting the quantity to the actual dollar amount. In order to do this I need to have an inventory of the item. Can I create inventory for a single item in Inventory without  causing the inventory license to be activated. I would very much appreciate