When you are creating a Purchase Order from the Quote Level you can now select either the entire section(s) or selected items within a section or a combination. 

Go to quote and to the desired level where you want to create the PO. 

Select Sections and/or single items

Go to the Details level -> Financial -> Create a PO -> Select entire sections by checking the checkbox or go into the section to mark the selected items. Only checked lines will be taken into the PO. 

Select single items 

Go to the Section level -> Financial -> Create a PO -> Select items

Create a PO for one item only

Go to the Section -> Item -> Three dots on the right -> Create a PO

Contact support if you have any questions.