FCCS: how to add The Non-Indexed Attribute to a dense dimension

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It is stated under the below documentation the following statement:

Specifying Indexed Attributes

When you create Custom Attributes for a dimension, you can specify that it is an Indexed attribute.

An indexed attribute dimension is the same as a traditional attribute dimension. It is sent to the database as an attribute dimension during cube refresh. It is not valid for dense dimensions, and requires all assignments for a given dimension to be at the same level.

A non-indexed attribute dimension is primarily a metadata construct used for filtering, although it can be materialized in the database during cube refresh in various ways, typically as a prefixed user-defined attribute. Since it does not materialize as an attribute dimension in the database, it can be assigned to multiple levels, and