add and tag to collections in applicationHost.config or web.config using Powershell webadministration module

add and tag to collections in applicationHost.config or web.config using
Powershell webadministration module

as per title, can someone help?
just an example:
<system.ftpServer>
<security>
<ipSecurity>
<add ipAddress="1.2.3.4" subnetMask="255.255.255.0" />
</ipSecurity>
</security>
</system.ftpServer>
I would like to add a tag as the first element to stop the elements
delegated from its parent. and a after as well.
So it will look like this:
<system.ftpServer>
<security>
<ipSecurity>
<clear />
<remove ipAddress="1.1.1.1" />
<add ipAddress="1.2.3.4" subnetMask="255.255.255.0" />
</ipSecurity>
</security>
</system.ftpServer>