A method for data processing includes displaying, at a user interface, a plurality of attributes that are defined by a data model configured for a tenant of a multi-tenant system. The plurality of attributes includes a one-to-many attribute that is configured to support multiple inputs and a direct attribute configured to support a single input. The method may further include receiving a selection of a first one-to-many attribute for defining an expression for identifying a segment of entities. The method may further include activating, for selection at the user interface, a subset of the attributes based on each attribute of the subset being dependent on the first attribute. The method may further include receiving an indication of the expression, executing a database query to identify the segment of entities, and transmitting, to a content communication system, an indication of the segment of entities.