How should interim altitude be correctly identified according to the altitude qualifiers?

Interim altitude is defined as the altitude level assigned to an aircraft that is temporarily holding while maintaining a specific flight profile. According to the altitude qualifiers, interim altitude should be displayed in the B1-3 field. This identification ensures that controllers can easily distinguish interim altitudes from other altitude types, like assigned or requested altitudes. The B1-3 field is specifically designated for interim altitudes, making it clear and systematic for air traffic control operations. This standardized practice aids in efficient communication among controllers and between controllers and pilots, reducing the likelihood of confusion or errors when managing air traffic.