I was just wondering if I have to extend the custom schema to add additional columns or can I simply modify the custom schema instead of extending it again.
extending schemas is only ment for the out of the box schemas - normally you are not able to modify them directly, thus the extending is in place. If you create custom schema you do not need to extend it, insted just:
extending schemas is only ment for the out of the box schemas - normally you are not able to modify them directly, thus the extending is in place. If you create custom schema you do not need to extend it, insted just: