Hi Jan
There are no OOTB table you can use for this purpose.
You will have to create your own import table and a transform map to create the relationships.
The relationships must be imported into the cmdb_rel_ci table and there are three fields to fill out - Parent, Child and Type.
The full way is to create a data import set
- Import Sets - ServiceNow Wiki
A quicker way is to create an "Easy import" if you are not familiar with the transform engine
- Easy Import - ServiceNow Wiki
