Be on and Walk through

Be on verb - Appear in a show, on T.V. or radio.

Walk through and be on are semantically related. In some cases you can use "Walk through" instead a verb phrase "Be on".

Walk through verb - Perform in a perfunctory way, as for a first rehearsal.

Be on and walk through are semantically related. Sometimes you can use "Be on" instead a verb "Walk through".