To apply Restrictions, navigate to path: Modeller -> Edit -> Core Network Attributes -> Restrictions.
Restrictions can be used to represent physical obstructions which affect selected vehicles classes such as a low bridge restricting vehicles over a certain height.
By default, all newly created networks do not have any restrictions. Restrictions are applied as a lane attribute but PT only and Closed can be applied to an entire link level as well as lane without having to create any restriction
For further details, refer Paramics Help at path: User Manual -> Paramics Product Suite -> Modeller -> Using Networks -> Core Network Attributes -> Restrictions.