How to replace data in a specific cell in FCCS

Summary

How to replace data in a specific cell in FCCS like HFM does

Content

Hi all

We would like to know if there is a "command" allowing FCCS value to be replaced by another values in Forms.

Example ( See attached) 

Por defecto, en el sistema, Cuenta A - Flujo A contiene 100, pero con un Override(1,1), Fila 1 - Columna 1, querría que me mostrara 500 (Cuenta A - Flujo C), sin tener que ser Flujo C un elemento a introducir en las columnas

By default in the FCCS system Account A - Flow A has a value of 100, but with an override / replace