Hi,

If you have this Category in MT4:
    Category A
    Category B
    Category C
    Category D
    etc.

and wish select some category, this is the solution:

CODE
<mt:IfArchiveTypeEnabled archive_type="Category">
<div class="widget-archive widget-archive-category widget">
    <h3 class="widget-header">Canali selezionati</h3>
    <div class="widget-content">

    <mt:TopLevelCategories>

<mt:SetVarBlock name="IncludeCategory"><$MTCategoryLabel$></mt:SetVarBlock>
    <mt:If "$IncludeCategory" like="(Category A|Category B|Category C)">

        <mt:SubCatIsFirst>
        <ul class="widget-list">
        </mt:SubCatIsFirst>
        <mt:IfNonZero tag="mt:CategoryCount">
            <li class="widget-list-item"><a href="<$mt:CategoryArchiveLink$>"<mt:IfNonEmpty tag="mt:CategoryDescription"> title="<$mt:CategoryDescription$>"</mt:IfNonEmpty>><$mt:CategoryLabel$> (<$mt:CategoryCount$>)</a>
        <mt:Else>
            <li class="widget-list-item"><$mt:CategoryLabel$>
        </mt:IfNonZero>
        <$mt:SubCatsRecurse$>
            </li>
        <mt:SubCatIsLast>
        </ul>
        </mt:SubCatIsLast>
          
</mt:If>

    </mt:TopLevelCategories>
    </div>
</div>
</mt:IfArchiveTypeEnabled>


Ciao

Raffaele