Insert into returning lookup ID instead of value

Insert into returning lookup ID instead of value

I am creating records on a secondary form on submit and everything works great except the client field, since is a lookup field on the main form, it is inserting the ID into the secondary form record, can you please help me telling me how to convert the ID to value?

[
Added_User = zoho.loginuser
Cliente = Cliente (this is a lookup field)
Codigo = Paquetes_sub.Codigo
Telefono = Telefono
Paquete = Paquetes_sub.Paquete
Fecha_de_vencimiento = Paquetes_sub.Fecha_vencimiento
Servicios_disponibles = 2
Saldo = 0.0
]

Thanks,