This page contains a list of all relations of this category. To create a new relation, click the ‘New' button (two opposite green arrows with a sun). This will pop up a category picker, where you can choose one category. 
<ul>
  <li> Relation ID – a read-only field, the internal system ID of the relation, guaranteed to be unique throughout the system. It is blank when a new relation is created. 
  <li> Item – a read only field, the destination item type ‘category'. Categories can only be related to categories. 
  <li> Type – ‘reciprocal' designates a two-way relation, and ‘one way' – a one-way relation. 
  <li> Enabled – the status flag of the relation. 
  <li> Priority – the numerical priority of the relation.
</ul>