This field is optional for spreadsheets. Enter the text authority if it is known. Doing so will help with authority resolution once the hymnal is uploaded. (The text authority id can be found by locating the text in Hymnary and clicking on the Edit link; or it may be found in the URL)
The text authority for Readings is "Readings", for a liturgy "Liturgy" for a prayer "Prayers", and for Amens "Amen"