adding records with combobox selection

[Russ]

I've got a form/subform and I'm trying to add records to a table using
a combo box on the subform that looks up records in a table.

When I select the next record on my main form the subform (which is
set up as a data entry form) displays the records from the table I am
trying to add the selection to instead of being blank until I click on
it. Consequently, when I make a new selection with the combo box, a
new record is not added to the table, but the displayed record's value
is changed to the new selection.

This is not what I want. I want to add new records, not modify
existing records.

Any help?

Russ