Connectors are retrieved automatically after a component is placed.

Release: Creo Schematics 4.0

You can watch a video that demonstrates this capability.

When a wiring component is placed, the attaching connector is selected automatically. The connector is defined by the parameter mates_with on the component. The value should equal the value of a connector parameter within either the artifact properties or a data set. The parameter used for searching is defined in the configuration settings.