Follow the below steps to add an additional column in the contents pane that once completed can be added by right clicking the header and adding.
1. Create a XML file under the path $ SPECROOT/custom/topo/config
2. Paste the below content in the XML which you created and save it.
<?xml version="1.0" encoding="utf-8" ?>
- <table idref="table-searchresults-config">
3. After adding the above you should be able to right click add and open it.