Can I import partial XML?

Hi,

I have a PDF form which has a unique identifier embedded in a hidden field. When I export the XML, the UID is visible and can be edited.

What I want to do is then edit this XML as a generic template to import into other PDF forms of the same type, but when I import the XML I want to avoid overwriting the UID inside the form.

Is it possible to import all other XML, bar this one field?

I've tried removing the field from the XML and also putting the field as blank in the XML, but either way it overwrites the existing UID in the PDF with blank, making the form un-usable (it gets submitted online and the UID is required as-is).

Thanks in advance,

Donald