Limiting Subform View

If you have a fixed value, you can put it in the filters.


But I suppose it is a value given by the main form.
So in the subform, you need to create a function that receives that value:

Function InputParameters(TheValue)
BEGIN
  SETFIELD("Some Field",'%1..',TheValue);
  CurrForm.UPDATE(FALSE);
END;

You also need to give a name to your subform in the main form.
And in the main form, you need to call the function. Generally done from the OnAfterGetCurrRecord-trigger (and NOT OnAfterGetRecord!)

CurrForm.SubForm.FORM.InputParameters('Some Value');