The sub-grid is used to display records on another entity.
These two sub-grids are associated to two different entities, right?
If you want to show something in the first sub-grid, the first entity(Modulbokning) should have recordscreated.
This means that you need create new records for the first entity(Modulbokning) automatically when you select records of the second entity(Moduler).
If so, you can create one on-demand workflow on the second entity, use the workflow to create new records of first entity, then you can run the workflow when you select records in the second sub-grid.
I hope you can mark my answer verifiedif it is helpful! If you have any questions, please feel free to contact me.
Regards,
Leah
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