hasMany relationship in form?

So i'm essentially looking to build something like the example found in the demo..

I have a "Leads" model, which hasMany "Jobs".

I would like when i click a lead, it shows below any related jobs like in the attached picture..

Apologise if this is well documented and I'm just missing it completely, but I'm struggling to get my head around a few of the bigger concepts of filament currently.. If someone could point out what part of the doc or point me to where I can configure this, I would very much appreciate it!
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