Creating tabs in liferay portlet:-
basic steps:-
1) Create a liferay prject
2) Add  the following jar files in liferay-plugin-packages.properties :-

1. Jstl-api.jar and 
2. jstl-impl.jar files, and 
3. add c.tld file

3) In your Project ,create the following files under the following path
/docroot/jsps by creating a new folder called jsps

view.jsp
sunday.jsp
monday.jsp
tuesday.jsp
admin.jsp

4)code for view.jsp

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%@ taglib uri="http://liferay.com/tld/portlet" prefix="liferay-portlet" %>
<%@ taglib uri="http://liferay.com/tld/theme" prefix="liferay-theme" %>
<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c" %>
<%@page import="com.liferay.portal.kernel.util.ParamUtil" %>
<%@page import="java.util.ArrayList"%>
<%@page import="java.util.List"%>
<liferay-theme:defineObjects />


<liferay-portlet:renderURL var="portletURL"/>

<%

String tabValue = ParamUtil.getString(request, "tab", "sunday");
String tabsURL = "/jsps/" + tabValue.trim() + ".jsp";
String tabNames="Sunday,Monday,Tuesday" ;
String tabVal="sunday,monday,tuesday" ;
if(permissionChecker.isCompanyAdmin(themeDisplay.getCompanyId())){
tabNames+=",admin" ;
tabVal+=",admin" ;
}
%>

<liferay-ui:tabs
names="<%=tabNames%>"
tabsValues="<%=tabVal%>"
param="tab"
url="<%= portletURL %>"
/>

<c:import url="<%= tabsURL %>"></c:import>

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