How to import organizations with active relationships
Thanks to @petednz-fuzion, solution was very simple: 


install the Related permissions extension which is already included in CiviCRM extensions and that you can add from : domain.com/civicrm/admin/extensions?reset=1
Set the parameters the way you need at: domain.com/civicrm/admin/reltype?reset=1
Select the relationship type you need to set
Scroll down to Related Permissions Settings and set them the way you fits your situation best