If you'd provide us some details of what you have, what you are doing, what
you expected to happen, and what is happening, perhaps someone here could
give you some useful help.
You should not have to _do_ anything, other than use default properties, for
a Form embedded in a Subform Control to save data at the designated times:
when you move back to the main form, or when you close the main form, or
when you explicitly code to save the subform.
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