Dependency setting is overrated. You most of the time don´t need it.
A relevant dependency would be, if you have a modified Part ItemType with custom properties and you need to ensure that imported Part match the customized ItemType. Or you import a custom solution that needs to have a certain non-common solution installed (like MPP, CE, custom stuff...).
The package you mentioned is normally always installed in your Innovator.
If you cannot find your parts there are multiple reasons:
- If it´s really due to an error, check the log text files in the export/import tools for more details
- If it´s not error: Do you use a custom number generator? If you export your Parts with a specific item_number and than import them into an instance with number generator, your Parts will renumbered and you might not find them.