There will be two default columns (Owner, Owner Legacy Id).
In excel import an imported row will have (at most) one owner. There can be multiple possible owners.
Empty cells will be considered null.
Serial data type fields will be auto generated if any value found in cell, otherwise the value in the excel will be imported.
The sheet name needs to be name of the entity. (eg. Bestillingsenhed).
Import option will be found for only project level.
This import will only work for starbas project.
Sample Excel File