By keeping your custom code and elements in the same Package (Project), it’s easy to share this with your account, team, or workspace.
In your package.json file in the tree structure, scroll down to Package Availability.
Share with Account
Make your code package available to everyone on your account, all your accounts members will have this package available to use when inserting Elements.
Share with Teams
Make your code package available to everyone on a specific Team.
Share with Workspace
Make your code package only available inside a specific Workspace.
Access is shared to all users on your current account.
Using a shared package
With the share settings set to allow users of your account usage of the current package, it will show up to them when clicking Insert in the Design Editor.