When I go
Top > Service Director > IP Manager > IP Pools, select one of my IP Pools and click "Add" next to "Selected Groups only", nothing happens.
Such behaviour is caused by the software issue PBAS-29811 that was fixed in OBAS 4.5.4 version.
To resolve the issue, please upgrade to 4.5.4 as described in How to upgrade PBA-S system to the latest available version.
If upgarde is not an option for you, there is a hotfix for 4.5.3.
For 64-bit operating systems: download the hotfix and install it:
# rpm -Uhv hspc-ipmanager-4.5.3-35.swsoft.x86_64.rpm # service hspcd restart
For 32-bit operating systems: download the hotfix and install it:
# rpm -Uhv hspc-ipmanager-4.5.3-35.swsoft.i386.rpm # service hspcd restart