The Snapping tab is only enabled when the Theme is flagged as Snapping. (Snap to Theme property is set to ‘S’) and therefore applies only to off-network assets and non-asset layers.

Users must then enter the Linear Network layers to be snapped to - in a priority order (there can be more than one).

• Priority (Required): Enter the order in which features in the theme are to be snapped to the target.
• Snap to Theme (Required): Enter the name of the target theme that features in the theme are to be snapped to. This is limited to Linear groups and datum layers.