I. Hola Fernando, aunque sólo soy lector deseaba trasladarle la información que vi sobre su consulta, tal vez pudiese serle de utilidad mientras le atiende una persona con formación de Excel, de las varias existentes en la comunidad.
Le ruego me perdone todas las molestias de tanta lectura y la manera de responderle. Suerte,
https://www.reddit.com/r/excel/comments/12xy35o/how_to_set_error_alert_on_sum_cell/?tl=es-es
https://www.reddit.com/r/excel/comments/179t0mw/formula_for_limiting_result_and_displaying_error/
https://stackoverflow.com/questions/68697161/how-do-i-create-a-data-validation-to-ensure-the-sum-of-column-does-not-exceed-a
https://www-ablebits-com.translate.goog/office-addins-blog/excel-data-validation-custom-formula/?_x_tr_sl=en&_x_tr_tl=es&_x_tr_hl=es&_x_tr_pto=sc
https://www.ablebits.com/office-addins-blog/excel-data-validation-custom-formula/
https://www.excelforum.com/excel-general/1326127-error-alert-when-a-value-exceeds-a-limit.html
https://www.mrexcel.com/board/threads/custom-data-validation-error-message-using-value-from-a-cell.1174414/
https://www.youtube.com/watch?app=desktop&v=OHki1vMSo6gSpeed
https://www.youtube.com/watch?v=luympe8dQ8Q
https://www.mrexcel.com/board/threads/data-validation-prevent-entry-if-sum-is-greater-than-a-cell.962047/
https://www.reddit.com/r/excel/comments/1gpva3w/how_to_stop_sum_of_values_exceeding_100/?tl=es-419