Is there a way to create subforms?

Hi,
I am exploring kobotoolbox capabilities to migrate from another form service.
Use Case : I trace bags against fraud through multiple locations.
Colllection Event (Date, Location, Monitor) and as subforms for every bag (tagnumber, weight)
Depends on the number of the bags, monitor add a subform for every bag.
At the end all bags are connected to collection event.

How can I create such a form here ?

Thanks

@rci, did you mean you wish to link the submission from one form to another through a unique id?

This is one question and but real question is :
how can I implement my use case on KOBO ?
a user add dynamically more bag information … it could be 4 or it could be 40 and those information is linked to shared_set_of_data …

Today I make a collection at location A and I want to collect details of the bags.
But the number of bags is dynamic. It could be 1 or it could be 50.

At my current tool I can solve it as follows
1 main form to get collection event data
1 sub form to get detailed data for a bag.
When a user opens the main form, at the end of the form, he can click as many times as he wants which opens the subform where the user enter details for a single bag.

I could not find any subform logic here therefore I am asking how would be possible to collect such information on KOBO.
Thanks

For sub form; you can use ‘repeat’