In order to add an element or attribute to a subset as a sub-property of a type, this relationship must be captured explicitly. The SSGT will not do this automatically. Many properties belong to more than one type; other times a property may be added to a new type in an exchange.
Add button. For sub-properties, the button also includes a drop-down icon on the right side to allow users to set sub-property options. Other Add buttons do not have these options so they do not have this drop-drown. 
+ icon next to a component to expand the list of sub-properties.Add button next to the property name.Elements or Attributes section of the subset list on the left.Types section of the subset list on the left.+ icon next to the type in the subset list to view all of its sub-properties in the subset.In the example below, element
nc:OrganizationLocationis added to the subset as a sub-property of typenc:OrganizationType.(1) The user expands the list of sub-properties for type
nc:OrganizationType.
(2) The user adds elementnc:OrganizationLocationto the subset as a sub-property ofnc:OrganizationType.
(3) The SSGT adds the element to the subset list.
(4) The SSGT adds the type to the subset list along with its sub-property.

Adding sub-properties to a type will happen automatically for any property added to a subset from a type page, in the Contains section.
Adding nc:LengthUnitAbstract to the subset from type type page for type nc:LengthMeasureType will automatically add it as nested under the type.

Click the drop-down on the Add button to set custom options for the sub-property:
