If N4 includes a list of values (LOV) that you would like to use in a dynamic flex field or dynamic entity field, you can do so when creating a variform override.
To include a system-defined LOV:
In the Metafield Diagnostics for UI Tier view, find the field that uses the LOV you want to use; then identify the following:
In the Widget column, the LOV key, such as lov:key=com.navis.security.lov.USERS.SEARCH.
In the Widget SubType column, the type of widget, such as LOV_SEARCH_POPUP.
In the Database-Backed Variforms view (on page 1), create a variform override using the Variform File Definition form (on page 1) or the Override for a Variform Object form (on page 1).
In the Variform XML field, add the LOV key and widget subtype information to the respective field. For example:
<item fieldId="customEntityDynamicComponent.cdeFooUser">
<item-attribute type="lovKey">com.navis.security.lov.USERS.SEARCH</item-attribute>
<item-attribute type="widgetSubType">search</item-attribute>
</item>
Click Save; then close the form.