The following command adds a SubVS to the 20.200.25.200 Virtual Service:

curl -k "https://bal:1fourall@10.154.25.100/access/modvs?vs=20.200.25.200&port=80&prot=tcp&createsubvs="

Response:

<?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>
.
.
.
<TlsType>N</TlsType>
<NeedHostName>N</NeedHostName>
<OCSPVerify>N</OCSPVerify>
<NumberOfRSs>1</NumberOfRSs>
<SubVS>
<VSIndex>23</VSIndex>
<RsIndex>24</RsIndex>
<Name>-</Name>
<Forward>nat</Forward>
<Weight>1000</Weight>
<Limit>0</Limit>
<Enable>Y</Enable>
</SubVS>
</Data>
</Success>
</Response>