What is the archive sub-account feature?

The archive sub-account feature is a tool for removing inactive sub-accounts from the main Sub-Accounts' list , i.e. sub-accounts that don't have a balance and haven't produced hashrate for the last 24 hours or longer. Part of implementing this feature involved creating a tabbed layout in the Sub-Accounts' view to display active sub-accounts in one tab and archived sub-accounts in the other:

Using archived sub-account feature: Archiving a sub-account

To archive a sub-account, navigate to the Sub-Accounts view and select a sub-account from the list in the "Active Sub-Accounts" tab that has a 1 hr Hashrate average of zero and zero active workers such as the sub-account aaa shown in the screenshot below:

Click on the sub-account's name to be navigate to its detail view
On the Dashboard, verify the 24 hour hashrate average for the selected sub-account is also zero as shown for aaa's dashboard here:

Next, select the Transactions' tab and confirm the balance of the sub-account is zero.

Once you've confirmed the balance and the hashrate (24 hour average) are both zero, navigate back to the Sub-Accounts' view and click on the "Archive" button next to the sub-account you want to archive:

Lets demonstrate this by archiving sub-account aaa. When we click the "archive" button, a confirmation dialog will appear:

if you click the "Archive" button, you should receive a "success" message as shown here:

And if you switch to the "Archived Sub-Accounts" tab, you'll now see the sub-account aaa listed here instead of in the "Active Sub-Accounts" tab:

Using archive sub-account feature: Unarchiving a sub-account

You can unarchive a sub-account by simply navigating to the Archived Sub-Accounts tab, selecting the sub-account you wish to unarchive and click the Unarchive button.
We'll demonstrate unarchiving using the same sub-account that we just archived: aaa
Click the unarchive button located in the "Un-Archive" column, in the row displaying the data for sub-account aaa:

You'll again be prompted to confirm the action with a dialog. If you wish to continue, click "Un-Archive"

Again, you should see a "success" message when the sub-account is unarchived successfully:

When you switch to the "Active Sub-Accounts" tab, you should now see your unarchived sub-account in the list