
You can also do one of these two things:
Hover over a card in a tree and select add new card. The new card will add as the card type next down in the hierarchy.
You can also click the Add Card link, lower left on the Grid view, then click Add With Detail. When the first card has been added, click "SAVE AND ADD ANOTHER". The new card will already have many of the same properties as the card you just added. This button appears when you edit a card too.
Hope this helps.
Mike

You can delete card types only if they are not used in your project.
The Delete link will show up beside the Edit link if there are no cards of that card type. To see this, just create a dummy card type, then look for the delete link.
Hope this helps!
Cheers,
Mike

You could have multiple Statuses - one for each activity that could be carried on concurrently - such us UI-Status, Dev-Status, etc.