copy part of a table on a new subtable

hello 

hello
I have a table with patients and it has become very large and I am trying to create a subtable to better organize data. But from those that I already have saved, I want to copy the variables already stored in the new subtable. 
I have this code that I'm testing:

let subRecord := (create Cirugias);
subRecord.(Pacientes := this);
subRecord.('Fecha de Ingreso' := this.'Fecha de Ingreso');
subRecord.('Fecha de cirugia' := this.'Fecha de cirugia');
subRecord.(FechaAlta := this.FechaAlta);
subRecord.('Requirio CTI' := this.'Requirio CTI');
subRecord.('Fecha Ingreso CTI' := this.'Fecha Ingreso CTI')

This effectively copies the variables but does not assign them to the "patient" although both tables are related.

I also tried this code but I didn't have any success either:

for p in select Pacientes do
    let subRecord := (create Cirugias);
    subRecord.(Pacientes := p);
    subRecord.('Fecha de Ingreso' := p.'Fecha de Ingreso');
    subRecord.('Fecha de cirugia' := p.'Fecha de cirugia');
    subRecord.(FechaAlta := p.FechaAlta);
    subRecord.('Requirio CTI' := p.'Requirio CTI');
    subRecord.('Fecha Ingreso CTI' := p.'Fecha Ingreso CTI')
end

please i need your help 

Leo Toscano