Accessing variables declared and defined in parent from child module

Hi,

I am quite new in using Terraform, please bear with me if my questions are silly.
My code structure is as follows:
Root:-----------
main.tf
variables.tf
main_values.tfvars
nva-------(/* child module folder */)
create_firewall.tf
variables.tf
firewall_values.tfvars

I have tried executing just the child module as a separate standalone one, it worked successfully.
As a next step I wanted to try out module configuration.
Root: ---- consists of only creation of vnet and subnets.
Child Module ----- creates AzureFirewall subnet in vnet created in parent .
and Azure Firewall in that subnet.
My issues:

1. How to refer to the vnet that is created in parent.
2. Although all values are provided in firewall_values.tfvars, it is still asking the values from the main.tf in parent where child module is getting called.

I know as per the module configuration I need to pass all the values at the time of calling the module. Is there any way I can point to values defined in firewall_values.tfvars file. If this is possible, then child module variables definitions can be segregated.

Thanks in advance.

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