1) First of all, you need to create the page in admin panel for the custom page.
open app/design/frontend/base/default/layout/customer.xml file from your root folder.</br>
You need to write the following code out of <default>tag.
<customer_logged_in>
<reference name="top.links">
<action method="addLink" translate="label title" module="cms"><label>Bulk orders</label><URL><![CDATA[https://www.domain.com/customage/]]></URL><title>Bulk orders</title><prepare/><urlParams/><position>10</position></action>
</reference>
</customer_logged_in>
<customer_logged_out>
<reference name="top.links">
<action method="addLink" translate="label title" module="customer"><label>Bulk orders</label><url helper="customer/getLoginUrl"/><title>Bulk orders</title><prepare/><urlParams/><position>10</position></action>
</reference>
</customer_logged_out>
open app/design/frontend/base/default/layout/customer.xml file from your root folder.</br>
You need to write the following code out of <default>tag.
<customer_logged_in>
<reference name="top.links">
<action method="addLink" translate="label title" module="cms"><label>Bulk orders</label><URL><![CDATA[https://www.domain.com/customage/]]></URL><title>Bulk orders</title><prepare/><urlParams/><position>10</position></action>
</reference>
</customer_logged_in>
<customer_logged_out>
<reference name="top.links">
<action method="addLink" translate="label title" module="customer"><label>Bulk orders</label><url helper="customer/getLoginUrl"/><title>Bulk orders</title><prepare/><urlParams/><position>10</position></action>
</reference>
</customer_logged_out>