Page Layout- Horizontal Rule

Page Layout- Horizontal Rule

When editing the layout of, for instance, the Potentials page, is there a way to insert a horizontal rule or white space in between fields?  I'd like to keep a group of fields in the same Section, but would like to create some seperation in order to further group together certain fields within the Section.  If this is not possible, does anybody have any other suggestions on how to create this same effect?
 
Thank you!