Index: io_lihata_ver.html
===================================================================
--- io_lihata_ver.html	(revision 38227)
+++ io_lihata_ver.html	(revision 38228)
@@ -116,6 +116,8 @@
 		<li> remove change_attrib operation
 		<li> introduce change_net_attrib operation for net attribs
 		<li> introduce change_comp_attrib operation for component (subc) attribs
+		<li> introduce comp_add operation
+		<li> introduce comp_del operation
 	</ul>
 
 <H2> lihata subcircuit </H2>
Index: lihata_format/pcb-rnd-board-v.svg
===================================================================
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Index: lihata_format/root_board.lht
===================================================================
--- lihata_format/root_board.lht	(revision 38227)
+++ lihata_format/root_board.lht	(revision 38228)
@@ -195,6 +195,22 @@
 									ha:val   { valtype=string; desc={new value of the attribute}}
 								}
 							}
+							ha:comp_add {
+								type=ha
+								ver {>=9}
+								desc { create a new subcircuit (component in netlist terminology) }
+								li:children {
+									ha:comp  { valtype=string; desc={component refdes }}
+								}
+							}
+							ha:comp_del {
+								type=ha
+								ver {>=9}
+								desc { remove a subcircuit (component in netlist terminology) }
+								li:children {
+									ha:comp  { valtype=string; desc={component refdes }}
+								}
+							}
 
 						}
 					}
Index: lihata_format/tree.html
===================================================================
--- lihata_format/tree.html	(revision 38227)
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@@ -86,6 +86,10 @@
 <tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/netlists/children/netlist_patch/children/change_comp_attrib/children/comp"><td> &nbsp;&nbsp;&nbsp;&nbsp;comp <td> <a href="#valtype:string">string</a> <td> &nbsp; <td> component refdes whose attribute needs to be changed 
 <tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/netlists/children/netlist_patch/children/change_comp_attrib/children/key"><td> &nbsp;&nbsp;&nbsp;&nbsp;key <td> <a href="#valtype:string">string</a> <td> &nbsp; <td> key (name) of the attribute
 <tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/netlists/children/netlist_patch/children/change_comp_attrib/children/val"><td> &nbsp;&nbsp;&nbsp;&nbsp;val <td> <a href="#valtype:string">string</a> <td> &nbsp; <td> new value of the attribute
+<tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/netlists/children/netlist_patch/children/comp_add"><td> &nbsp;&nbsp;&nbsp;ha:comp_add <td> &nbsp; <td> >=9 <td>  create a new subcircuit (component in netlist terminology) 
+<tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/netlists/children/netlist_patch/children/comp_add/children/comp"><td> &nbsp;&nbsp;&nbsp;&nbsp;comp <td> <a href="#valtype:string">string</a> <td> &nbsp; <td> component refdes 
+<tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/netlists/children/netlist_patch/children/comp_del"><td> &nbsp;&nbsp;&nbsp;ha:comp_del <td> &nbsp; <td> >=9 <td>  remove a subcircuit (component in netlist terminology) 
+<tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/netlists/children/netlist_patch/children/comp_del/children/comp"><td> &nbsp;&nbsp;&nbsp;&nbsp;comp <td> <a href="#valtype:string">string</a> <td> &nbsp; <td> component refdes 
 <tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/conf"><td> &nbsp;li:conf <td> &nbsp; <td> &nbsp; <td> <a href="#/lht_tree_doc/roots/pcb-rnd-conf-v1">complete pcb-rnd configuration tree -&gt; </a>
 <tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/data"><td> &nbsp;ha:data <td> &nbsp; <td> &nbsp; <td> <a href="#/lht_tree_doc/comm/data"> Layers and global objects of the board  -&gt; </a>
 <tr id="/lht_tree_doc/roots/pcb-rnd-board-v*/children/pixmaps"><td> &nbsp;ha:pixmaps <td> &nbsp; <td> >=7 <td> <a href="#/lht_tree_doc/comm/pixmaps"> Collection of all unique pixmaps used by the board or footprint  -&gt; </a>
Index: lihata_format/tree.txt
===================================================================
--- lihata_format/tree.txt	(revision 38227)
+++ lihata_format/tree.txt	(revision 38228)
@@ -80,6 +80,10 @@
     comp                 string     component refdes whose attribute needs to be changed
     key                  string     key (name) of the attribute
     val                  string     new value of the attribute
+   ha:comp_add                  >=9 create a new subcircuit (component in netlist terminology)
+    comp                 string     component refdes
+   ha:comp_del                  >=9 remove a subcircuit (component in netlist terminology)
+    comp                 string     component refdes
  li:conf                            complete pcb-rnd configuration tree ->
  ha:data                            Layers and global objects of the board ->
  ha:pixmaps                     >=7 Collection of all unique pixmaps used by the board or footprint ->