Add child module to show hierarchy of processing tfvars

terraform-tfvars/modules/main.tf

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+//referencing ubuntu AMI
+data "aws_ami" "ubuntu" {
+  most_recent      = true
+  owners           = ["099720109477"] #Canonical
+
+  filter {
+    name   = "name"
+    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
+  }
+
+  filter {
+    name   = "virtualization-type"
+    values = ["hvm"]
+  }
+}
+
+//spinning up another billing server
+resource "aws_instance" "billing_server" {
+  ami = data.aws_ami.ubuntu.id
+  instance_type = var.instance_type
+  tags = {
+    "service" = "billing"
+  }
+}

terraform-tfvars/modules/terraform.tfvars

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+instance_type = "t2.small" 

terraform-tfvars/modules/variable.tf

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+variable "instance_type" {
+  type = string
+  description = "EC2 instance type"
+}