The following command deletes SubVS 23.

Situation before delete: 

<?xml version="1.0" encoding="ISO-8859-1"?>
<Response stat="200" code="ok">
<Success><Data><Status>Down</Status>
<Index>22</Index>
<VSAddress>20.200.25.200</VSAddress>
<VSPort>80</VSPort>
<Enable>Y</Enable>
<NumberOfRSs>1</NumberOfRSs>
.
.
.
<SubVS>
<VSIndex>23</VSIndex>
<RsIndex>24</RsIndex>
<Name>nickname</Name>
<Forward>nat</Forward>
<Weight>1000</Weight>
<Limit>0</Limit>
<Enable>Y</Enable>
</SubVS>
</Data>
</Success>
</Response>
curl -k "https://bal:1fourall@10.154.25.100/access/delvs?vs=23

Situation after delete: 

<?xml version="1.0" encoding="ISO-8859-1"?>
<Response stat="200" code="ok">
<Success><Data><Status>Down</Status>
<Index>22</Index>
<VSAddress>20.200.25.200</VSAddress>
<VSPort>80</VSPort>
<Enable>Y</Enable>
.
.
.
<NumberOfRSs>0</NumberOfRSs>
</Data>
</Success>
</Response>