Hi Arun,

The main.ftl is for the root community.  If you want to remove the Overview tab for a specific community under the root community, you'll want to theme community.ftl.  Another approach would be to modify the community-tabs overview ui component in your plugin.xml so that the <when> clause evaluates to false on your target community:

<component id="community-tabs">
        <tab id="overview"
             cssClass="jive-link-overview">
            <name><![CDATA[<@s.text name="comnty.tab.overview" />]]></name>
            <description><![CDATA[<@s.text name="comnty.tab.overview.desc" />]]></description>
            <when><![CDATA[CommunityPermHelper.isCommunityAdmin(community) || action.isHasCustomized()]]></when>
            <url>
                <![CDATA[<@s.url value='${JiveResourceResolver.getJiveObjectURL(community)}'/>?view=overview<#if tagSet?exists>&tagSet=${tagSet.ID?c}</#if>]]></url>
        </tab>

Hope that helps!

My mistake, it's actually in the community-header.ftl.  See this section:

    <#assign component = UIComponents.getUIComponent('community-tabs') />
    <!-- BEGIN browse community tabs -->
    <div class="jive-body-tabbar">
        <@jive.displayTabs component ; tab >
        <#if (tab.id == "overview" && (CommunityPermHelper.isCommunityAdmin(community)) && (!widgetContainerBeingEdited || widgetContainerEditUser.ID == user.ID))>
            <span id="jive-${tab.id}custom-tab" class="jive-body-tab <#if view == tab.id >jive-body-tabcurrent</#if>">
                <span class="jive-body-tab-customizable">
                    <a title="${processAsTemplate(tab.description!)}" href="<@s.url value='${JiveResourceResolver.getJiveObjectURL(community)}'/>?view=${tab.id}<#if tagSet?exists>&tagSet=${tagSet.ID?c}</#if>"><span class="${tab.CSSClass!}"></span>${processAsTemplate(tab.name!)}</a>
                    <em>(<a href="<@s.url action='customize-community' />?community=${community.ID?c}" class="jive-link-overview-customize"><@s.text name='comnty.tab.customize' /></a>)</em>
                </span>
            </span>
            <#else>
            <span id="jive-${tab.id}-tab" class="jive-body-tab <#if view == tab.id >jive-body-tabcurrent</#if>">
                <a title="${processAsTemplate(tab.description!)}" href="${processAsTemplate(tab.url!)}"><span class="${tab.CSSClass!}"></span>${processAsTemplate(tab.name!)}</a>
            </span>
        </#if>
    </@jive.displayTabs>

Hi Wally,

Unfortunately, I haven't actually written this customization, I was merely giving tips on how it could be done.  If you're just looking for info on how to do theme mapping, there are docs here.  Arun may be able to provide you with some screenshots though?