Update B300-E7 model

PROD-37077

Change-Id: Ic3d79a338e88864e40d2cacd4c656012d9ed84c2
diff --git a/tcp_tests/templates/bm-b300-e7-cicd-pike-ovs-maas/maas_subnet_add.yml b/tcp_tests/templates/bm-b300-e7-cicd-pike-ovs-maas/maas_subnet_add.yml
new file mode 100644
index 0000000..190574c
--- /dev/null
+++ b/tcp_tests/templates/bm-b300-e7-cicd-pike-ovs-maas/maas_subnet_add.yml
@@ -0,0 +1,15 @@
+parameters:
+  maas:
+    region:
+      subnets:
+        additional_network:
+          name: additional_network
+          cidr: 10.200.200.0/23
+          fabric: ${maas:region:fabrics:fabric-0:name}
+          gateway_ip: 10.200.200.1
+          ipranges:
+            3:
+              end: 10.200.201.254
+              start: 10.200.200.5
+              type: dynamic
+              subnet: ${maas:region:subnets:additional_network:name}
\ No newline at end of file