When we place an order to buy some goods, we need to raise purchase order. This page shows on how to create a purchase order.
To create a purchase order, go to Purchase->Purchase Order as shown below.
Click on +New Purchase Order as shown below.
In the next page we need to feed in the details of the product, vendor, etc.. as shown below.
After doing all the above, click on Calc Total then Save as shown below.
On successful creation the following screen appears.