Pasting data into table with multiple elements in a cell

[p_kn]

I could easily reconstruct the pasting of requirements with relations into a requirements table, as shown in https://www.youtube.com/watch?v=C2wc3BbJmjw
I tried a similar thing to import actors and a generalization relation. So, I have the columns "name", "description" and a derived property column, type simple navigation, "generalization" ticked. Pasting from Excel works so far, the relations are created. BUT: Only the first generalizing actor is in that last column. If there are more (seperated by alt+enter in excel), they get ignored. The multiplicity of the derived property is 0...*. What can I do to make it work similarly like in the requierments table, where I can easily import more than one relation? Thanky for any hints.