I have a requirement to add extra column to below properties tab of a node.
By default it will have (Name,Type,Value,Protected,Mandatory,Multiple). I want one more column "test" to be added to the below list.
Any pointers appreciated
OOTB page properties tabs are read from "/libs/wcm/foundation/components/basicpage/v1/basicpage/cq:dialog/content/items/tabs/items" . So, you can overlay the tabs using sling resource merger and add/remove custom tabs.
For more details, check "Configuring your Page Properties" at  to add the custom tabs.