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# in some_layout.html.erb
<html>
	<head>
		...
	</head>
	<body>
		<% render :partial => 'header' %>
		...

# in _header.html.erb
<div id="header">
	<ul id="menu">
		<% yield :menu_options %>
	</ul>
</div>

# in _index_menu_options.html.erb
<li><a href="#">Foo</a></li>
<li><a href="#">Bar</a></li>

# in index.html.erb
<% content_for :menu_options %>
	<%= render :partial => 'index_menu_options' %>
<% end %>