You can add a Discretization node () to defines a discretization field, which is a physics field that do not declare any model-scoped dependent variable. The setting basically is the Discretization section from the Dependent Variable Declaration node (see Discretization above) but also with a name and a parameter description declaration.

A Variable Definition node that defines a shape function (shape variables) can refer to a discretization field and let that field determine the shape order, complex value type, and boundary flux settings for that shape. A variable definition can also refer to a dependent variable declaration node, and thereby use that variables shape order, complex value type, and boundary flux setting.

You can also refer to this node in expressions using the order prefix, which will return the currently selected order for the discretization field. There is also an intOrder prefix to get the integration order for a dependent variable or a discretization field.

Right-click the Discretization node to add a Hide in GUI subnode if required. You can, for example, add a condition for hiding the settings in the physics interface or to disable declaration of all shape variables that refer to this Discretization node.