Pulling Data From Child to Parent

Pulling Data From Child to Parent

Hi all,
I'm new to Zoho and Have been experimenting and would really appreciate y'alls help with a issue I'm having.

I have three forms - FMEA, Part, and Failure. 

Failure is a child of Part (there is a lookup for failure in Part) and FMEA has lookups for both Part and Failure.

How can I set it up so that when I add a Part to FMEA, the Failures in the Part are loaded into the Failures Section in FMEA?

Part is only a tool we use to categorize failures and quickly add multiple failures to an FMEA so I need the failures to be directly tied to FMEA.

Thanks