Denali, your problem is only scoped, once within a block your scope becomes the current object, so to access the parent object you need to use ../
to go up one level:
var arraySeq = [1,2,3,4];
var selectMenu = [
{ value: "1", descricao: "1" },
{ value: "2", descricao: "2" },
{ value: "3", descricao: "3" },
{ value: "4", descricao: "4" },
{ value: "5", descricao: "5" },
{ value: "6", descricao: "6" },
{ value: "7", descricao: "7" }
];
var model = {
arr: arraySeq,
menuselect: selectMenu
};
var tmlMenu = Handlebars.compile( $('#tmlMenu').html() );
var menus = $.parseHTML(tmlMenu(model));
$("#conteudo").append(menus);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><linkhref="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script><scriptsrc="http://www.fsfoo.com/js/vendor/handlebars-1.0.rc.2.js"></script>
<div id="conteudo"></div>
<script id="tmlMenu" type="text/x-handlebars-template">
{{#each arr}}
<div class="main" >
<div class="component-container "></div>
<ul class="nav">
<li class="col-md-5"><input type="text" class="info-num-perg form-control" style="width: 100%" value="{{this}}"/></li>
<li class="col-md-5"><input type="text" class="info-notapergunta form-control" placeholder="Digite"/></li>
<li class="col-md-2">
<select class="info-perg">
{{#each ../menuselect}}
<option value="{{this.value}}">{{this.descricao}}</option>
{{/each}}
</select>
</li>
</ul>
</div>
{{/each}}
</script>