Integration Podio - Integromat

I am using Integromat to create items in Podio and I am having some challenges to create arrays (mulitple items/Relationships) in Integromat and assign them in Podio. I have already create a full post in facebook with videos. Hopefully someone can help me out here.

The core of the issue is that in Integromat I can assign one relationship item to another item (eg. Order:Ordeline 1:1) but I can not manage to create a 1:n relationship (eg. Order:ORderline 1:n) although I can create an array in the right format in Integromat.

The videos explaining what I want and the issue I am facing are here.

https://www.facebook.com/groups/integromat/posts/3857195854391019