diff --git a/RELOG b/RELOG
new file mode 160000
index 0000000..5ea3e10
--- /dev/null
+++ b/RELOG
@@ -0,0 +1 @@
+Subproject commit 5ea3e10139afdf0fc6e721a000dc5bc29a975ac4
diff --git a/web/src/components/CaseBuilder/CircularData.ts b/web/src/components/CaseBuilder/CircularData.ts
index e69de29..ad569d7 100644
--- a/web/src/components/CaseBuilder/CircularData.ts
+++ b/web/src/components/CaseBuilder/CircularData.ts
@@ -0,0 +1,23 @@
+export interface CircularPlant {
+    id: string;
+    x: number;
+    y: number;
+
+    input?: string; // optional product name
+
+}
+
+export interface CircularProduct { 
+    id: string;
+    x: number;
+    y: number;
+}
+
+export interface CircularData {
+    plants: Record<string, CircularPlant>;
+
+    products: Record<string, CircularProduct>;
+
+    parameters: Record<string, any>; // Any parameters, ex: simulation years, costs 
+
+}
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