The mapping seems to work, for the artic circle at least

cellindex.js

@@ -104,6 +104,21 @@ export const LAYERS120 =  {
 		163,219,271,223,167]
 };
 
+export const CELL600_METAMAP = {
+    419: 41,
+    223: 49,
+    253: 45,
+    331: 53,
+    427: 109,
+    339: 105,
+    511: 51,
+    265: 107,
+    473: 111,
+    539: 55,
+    555: 43,
+    393: 47
+};
+
 export const CELL120_CELL5 = {
     "tetras": {
    },

polytopes.js

@@ -604,6 +604,56 @@ export const cell120_inscribe_cell5_subset = () => {
 	}
 }
 
+export const cell120_test_metamap = () => {
+        const o600 = cell600();
+	const nodes  = make_120cell_vertices();
+	const links = auto_detect_edges(nodes, 4);
+
+  	for( const cstr in CELLINDEX.INDEX120 ) {
+		label_nodes(nodes, CELLINDEX.INDEX120[cstr], Number(cstr));
+	}
+
+	links.map((l) => l.label = 0);
+
+	const mm = CELLINDEX.CELL600_METAMAP;
+	const mm_ids = Object.keys(mm).map((i) => Number(i));
+	console.log(mm_ids);
+
+	for( const p of [ 1 ]) {
+		const nodes600 = nodes.filter((n) => n.label === p);
+		const links600 = auto_detect_edges(nodes600, 12);
+		console.log(links600);
+		const mm_links = links600.filter((l) => {
+    		    //console.log(`${l.id} ${l.source} ${l.target}`);
+    		    return mm_ids.includes(l.source) && mm_ids.includes(l.target)
+		});
+		console.log(mm_links);
+		mm_links.map((l) => l.label = p);
+		links.push(...mm_links);
+	}
+
+	nodes.map((n) => {
+	    if( mm_ids.includes(n.id) ) {
+                const mapid = mm[n.id];
+                const n600 = o600.nodes.filter((n) => n.id === mapid);
+                n.label = n600[0].label;
+	    } else {
+    	        n.label = 0;
+	    }
+	});
+
+	return {
+		name: '120-cell-metamap',
+		nodes: nodes,
+		links: links,
+		options: [
+			{ name: "none", links: [ 0 ]},
+			{ name: "one inscribed 600-cell", links: [ 0, 1 ] },
+        	],
+		description: `foo`,
+	}
+}
+
 function partition_coord(i, coords, invert) {
 	const j = invert ? -i : i;
 	if( j >= 0 ) {
@@ -1029,7 +1079,7 @@ export const build_all = () => {
 		cell600(),
 		cell600_layered(),
 	 	cell120_inscribed(),
-	 	cell120_inscribed_cell5(),
+	 	cell120_test_metamap(),
 	 	cell120_layered()
 	 	];
 }