Purchases can be copied one at a time or more at once.
In order to copy a purchase, click on the Copy option in the menu. 
When a purchase is copied, date of the new purchase is set to current date. Data that is copied from the original document:
- Basic information - partner, category, currency, TAX included, department, payment method.
- Purchase items - items and quantities are copied while the prices are set based on the current price in the price list.
Link to the copied document is visible at the bottom of the purchase order Details/Edit page.
Bulk copy option
To copy more than one document at a time you can use Bulk Copy option. 
Select  the purchase to copy, and then click on the [COPY] button.