Index: trunk/src/sch-rnd/multi.c
===================================================================
--- trunk/src/sch-rnd/multi.c	(revision 10238)
+++ trunk/src/sch-rnd/multi.c	(revision 10239)
@@ -320,6 +320,21 @@
 	return sheet;
 }
 
+csch_sheet_t *sch_rnd_app_load_sheet(csch_project_t *proj, const char *path)
+{
+	int is_project;
+	csch_sheet_t *res;
+	rnd_design_t *last;
+
+	last = rnd_multi_switch_to(NULL); /* empty conf so we can overwrite */
+	res = sch_rnd_multi_load_(path, NULL, proj->hdr.loadname, &is_project, NULL, NULL);
+	res->stype = CSCH_SHTY_UNLISTED;
+	rnd_multi_switch_to_(last); /* activate the original */
+
+	return res;
+}
+
+
 static csch_sheet_t *sch_rnd_multi_new_empty_(csch_project_t *prj, const char *fn)
 {
 	csch_sheet_t *sheet;
Index: trunk/src/sch-rnd/multi.h
===================================================================
--- trunk/src/sch-rnd/multi.h	(revision 10238)
+++ trunk/src/sch-rnd/multi.h	(revision 10239)
@@ -17,6 +17,9 @@
 csch_sheet_t *sch_rnd_multi_new_empty(const char *fn);
 csch_sheet_t *sch_rnd_multi_new_empty_in_prj(csch_project_t *prj);
 
+/* App-side loader for external hierarchic child sheets from hlibrary */
+csch_sheet_t *sch_rnd_app_load_sheet(csch_project_t *proj, const char *path);
+
 /* Assuming s is not the current sheet, unload it, removing from the list of
    sheets. If s is NULL, unload currently active sheet. */
 void sch_rnd_multi_unload(csch_sheet_t *s);
Index: trunk/src/sch-rnd/sch-rnd.c
===================================================================
--- trunk/src/sch-rnd/sch-rnd.c	(revision 10238)
+++ trunk/src/sch-rnd/sch-rnd.c	(revision 10239)
@@ -58,6 +58,7 @@
 #include <libcschem/util_export.h>
 #include <libcschem/event.h>
 #include <libcschem/csch_printf.h>
+#include <libcschem/hierarchy.h>
 
 #include "conf_core.h"
 #include "crosshair.h"
@@ -278,6 +279,7 @@
 	LIBCSCHEM_CFG_BIND(csch_cfg_multiport_net_merge, conf_core.compile.multiport_net_merge);
 	LIBCSCHEM_CFG_BIND(csch_cfg_hier_net_allow_rename, conf_core.compile.hierarchic.net_allow_rename);
 	LIBCSCHEM_CFG_BIND(csch_cfg_hier_net_rename_prefer_top, conf_core.compile.hierarchic.net_rename_prefer_top);
+	csch_app_load_sheet_cb = sch_rnd_app_load_sheet;
 }
 
 extern void sch_rnd_draw_uninit(void);