Index: trunk/src/obj_subc.c
===================================================================
--- trunk/src/obj_subc.c	(revision 28862)
+++ trunk/src/obj_subc.c	(revision 28863)
@@ -157,6 +157,28 @@
 	return dst;
 }
 
+pcb_layer_t *pcb_subc_layer_create(pcb_subc_t *sc, const char *name, pcb_layer_type_t type, pcb_layer_combining_t comb, int stack_offs, const char *purpose)
+{
+	pcb_layer_t *dst = &sc->data->Layer[sc->data->LayerN++];
+
+	dst->is_bound = 1;
+	dst->meta.bound.user_specified = 0;
+	dst->meta.bound.user_lid = -1;
+	dst->meta.bound.type = type;
+	dst->comb = comb;
+	dst->meta.bound.stack_offs = stack_offs;
+	if (purpose != NULL)
+		dst->meta.bound.purpose = pcb_strdup(purpose);
+	else
+		dst->meta.bound.purpose = NULL;
+
+	dst->parent.data = sc->data;
+	dst->parent_type = PCB_PARENT_DATA;
+	dst->type = PCB_OBJ_LAYER;
+	dst->name = pcb_strdup(name);
+	return dst;
+}
+
 static pcb_line_t *add_aux_line(pcb_layer_t *aux, const char *key, const char *val, pcb_coord_t x1, pcb_coord_t y1, pcb_coord_t x2, pcb_coord_t y2)
 {
 	pcb_line_t *l = pcb_line_new(aux, x1, y1, x2, y2, PCB_MM_TO_COORD(0.1), 0, pcb_no_flags());
Index: trunk/src/obj_subc.h
===================================================================
--- trunk/src/obj_subc.h	(revision 28862)
+++ trunk/src/obj_subc.h	(revision 28863)
@@ -172,7 +172,10 @@
 /* Find and save the aux layer in the cache, of it exists */
 void pcb_subc_cache_find_aux(pcb_subc_t *sc);
 
+/* Create (and append) a new bound layer to a subc */
+pcb_layer_t *pcb_subc_layer_create(pcb_subc_t *sc, const char *name, pcb_layer_type_t type, pcb_layer_combining_t comb, int stack_offs, const char *purpose);
 
+
 pcb_subc_t *pcb_subc_dup_at(pcb_board_t *pcb, pcb_data_t *dst, pcb_subc_t *src, pcb_coord_t dx, pcb_coord_t dy, pcb_bool keep_ids);
 
 /* Replace dst with a copy of src in place (preserving location and orientation