Hi Marcello,
To follow on from Alice's reply... I understand you are describing problems creating project local part support, before sharing your project with a colleague.
This feature should work without problems, so my best guess is that: you are not seeing the project local part support because you still have the SDK installed on your system.
Full installed SDKs will be used in preference to project local versions.
I would suggest that you try one of the following:
1 - share your project and see if the recipient can use it as expected, or
2 - delete your SDK and refresh your part support and see if the project local version appears (highlighted below are the refresh button and a local working path).

If this continues to fail please let us know what SDK you are using - a screen shot as above would be helpful. Also, please check the error log (search error in the Quick Access to enable the view) to see if any relevant error is reported.
Yours,
MCUXpresso IDE Support