You can use four different methods to create purchase orders from the Project section.

Create a regular Project purchase order

Click Project> Projects, and select a project.
Click Item task> Purchase order.
Click CTRL+N to create a new line. This opens the Create purchase orderdialog box.
In the Create purchase orderdialog box, enter or modify the information as appropriate, and then click OK.
In the lower pane of the Purchase orderform, create a new line.
Enter an item number, quantity, unit, and unit price. Repeat this process for each order line that is required for the order.

Create a Project purchase order from an item requirement

Click Project> Projects, and then select a project.
Click Item task> Item requirements.
Press CTRL+N to create a new line. Select the appropriate item requirement line, and then click Functions> Create purchase order.
In the Create purchase orderdialog box, select the Includecheck box to include individual lines in the purchase order, or select Include allto include all lines.
Click OKto close the form.