Yes it is possible, you need to remove it from the sitemap.
go to settings -> customizations -> export customizations -> export sitemap entity
open the xml and remove the following lines (end of file):
Code Snippet
<Area Id="ResourceCenter" ResourceId="Area_ResourceCenter" Icon="/_imgs/resourcecenter_24x24.gif" DescriptionResourceId="ResourceCenter_Area_Description">
<Group Id="ResourceCenter">
<SubArea Id="nav_lc_overview" ResourceId="Homepage_LearningOverview" DescriptionResourceId="LearningOverview_SubArea_Description" Icon="/_imgs/ico_18_129.gif" Url="/resourcecenter/overview.aspx" AvailableOffline="false" />
<SubArea Id="nav_lc_sales" ResourceId="Homepage_LearningSales" DescriptionResourceId="LearningSales_SubArea_Description" Icon="/_imgs/ico_16_sales.gif" Url="/resourcecenter/sales.aspx" AvailableOffline="false" />
<SubArea Id="nav_lc_marketing" ResourceId="Homepage_LearningMarketing" DescriptionResourceId="LearningMarketing_SubArea_Description" Icon="/_imgs/ico_16_marketing.gif" Url="/resourcecenter/marketing.aspx" AvailableOffline="false" />
<SubArea Id="nav_lc_services" ResourceId="Homepage_LearningServices" DescriptionResourceId="LearningServices_SubArea_Description" Icon="/_imgs/area/18_service.gif" Url="/resourcecenter/services.aspx" AvailableOffline="false" />
<SubArea Id="nav_lc_customization" ResourceId="Homepage_LearningCustomization" DescriptionResourceId="LearningCustomization_SubArea_Description" Icon="/_imgs/area/18_settings.gif" Url="/resourcecenter/customization.aspx" AvailableOffline="false" />
</Group>
</Area>
save and re-import (settings -> customizations -> import -> XML file), if there are errors you either took a element that is needed off or you didn't take one off.
