Use the Extra Dimension Selection node (

) to add selections to an extra dimension for the connection to an ordinary space-dimension part of the model.
To add a Extra Dimension Selection, under
Definitions Library right-click the
Selections node (

) and choose it from the context menu.
Choose an option from the Specify extra dimension list:
By reference (the default),
By tag suffix, or
From parent. For
By reference, select an option from the
Links from and
Link lists. For
By tag suffix, enter a
Tag suffix.
For Predefined, select an existing predefined selection from the
Selection list.
For From definitions library, select an existing selection from the
Definitions library.