activities structure

Hello eveyone,
I'm using Projector ver 12.3.3.
Here's my question,
When activities are imported (no error), tasks (mean lines in activities) are not linked to each other. I assume "originId" is should be used for the purpose I want
below the table import via activity. No other tables are imported.
In the example below, I expect ID 646 linked to 645, id 647 linked to 646, and ID 648 linked to 647.

Can you help to achieve my request?

In advance, thank you very much to the community.

JeremyidreferencenametagsidActivityTypeidProjectexternalReferencecreationDatelastUpdateDateTimeidUseridContactoriginTypeoriginIddescriptionidActivityidStatus645II - Domaine  2622 2026-01-30 1  645Domaine Intelligence Artificielle de la PSSI 1646I.AI.A -sub domain 2622 2026-01-30 1  645Cadre de gouvernance et d’usage de l’IA 1647I.A.05I.A.05 - sub domain 2622 2026-01-30 1  646Politique d’usage et de contrôle de l’IA 1648I.A.05.10I.A.05.10 - branch 2622 2026-01-30 1  647Définition des cas d’usage IA autorisés et interdits 1