What you need to do is import the content into the publication, but not update the publication itself. This is possible to do, but a bit complicated:
- Open DependencyFilters.xml. Make sure that you have a publication dependency filter in the Structure Dependency Filters group (by default, it is not included in any group, so add it).
- Select your package and open its mapping file. Set the ImportTitle for the publication to the title of the publication you are importing.
On the Dependency Filters screen, enable the structure dependency filter group.
On the Select Elements screen, select the elements that you want to import within the publication, but deselect the publication itself.
Import.
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