Easy-I want to automaticaly populate a subform with previous entri

[Jose Sobral]

I have a form with a subform on it. I select the parent field in the form
and fill the subform with records. When I move to the next value in the
parent field in the form, the respective subform values apear blank. What I
want is that the subform appear populated with the previous records that met
a certain criteria.
Do i have to create a button with special code to do this??
Please help. I m sorry if this is too obvious.

 

[Jose Sobral]

The problem is that when i change the value on the form (master) the next
subform fields are obviously empty waiting to be filled. What I want is that
they appear populated with a copy of the previous subform records of the
previous form field...

 

[Jose Sobral]

It is the second option:

I am saying they are related, but I want a new main
form record to be related to a copy of the records from
the previous main form record

Thanks for the interest in my case

if you have an email i can send you screen shots
Thanks again