What is a Parent Card?
When you begin to have more than a handful of cards, it can feel daunting to start organising all of them. Tags are a great help, but you might find that groups of cards work well together. You can group all of these cards inside a single 'parent' card. This process is fundamental for sharing, since sharing a single 'parent' card gives your friends instant real-time access to all the 'child' cards (if they are published!).
How to Open a Card
You can open any card by double-clicking its title, this will mark it as a priority card and position it within the sidebar inside the 'Card Tree', beneath 'Home'. This is an easy way to quickly pick up where you left off, as shown below:
The screenshot above gives you a good example of the power of nested card hierarchies. Here you can see 'Biomedical Engineering' is a parent card that has three child cards 'Fluid Mechanics', 'Statistics' and 'Anatomy'.
Note that every card that you open (clicking its title) will be added to the card tree, even if you do decide not add any child cards to it.
Creating a Parent Card (adding child cards)
If you open a card and create/join a card, it will automatically be added as child to that card. You can also add cards to another card from anywhere using the ( + ) "quick-add menu" during edit mode, as shown by the example below:
Parent-Child Relationship Options
In a similar way to tags, you can change the visibility of a card within it's parent:
Unlisted cards can only be seen by those users you have specifically added to a card. If a user joins the parent they won't be able to see this card (i.e. will not be automatically added as a member to this card). Also members of a parent who are Ghosts and Readers are only able to add unlisted cards.
Published cards can be seen by everyone who is a member of that parent.
You can also hide cards in a parent. TL:DR; Blue = published, Hidden = strikethrough.
Other use cases for Parent Cards
Here are a few extra cool use cases for parents:
General comment stream on the parent. If you are adding cards at the same time as other members, you can have a general discussion using comments on the parent card.
To-do list on the parent card. If you want to do a sprint or remind yourself of your milestones, you can set out objectives or to-dos on the parent card and check them as you go.