When you delete a bill, all time and expense entries go back to an unbilled state and can be billed again. If you made any edits to these entries after the bill was generated and checked the box for Update records, the entries will be updated with those edits when you re-generate the bill. If this box was not checked, the entries will not have those edits once you delete and re-create the bill. 

You can delete a bill from either the billing index or by viewing a single bill. When the bill is deleted, it can be found in the Archive subtab.

Billing index

1. Go to the Billing tab from the left navigation menu.
2. Locate the bill in either the Draft, Pending approval or Unpaid subtabs.
3. Select the dropdown arrow next to Edit and choose Delete bill.
4. When the warning prompt appears, select Delete invoice.

Viewing single bill

1. Go to the Billing tab from the left navigation menu.
2. Locate the bill in either the Draft or Pending approval subtabs.
3. Click the bill Id.
4. Click More actions and select Delete.
5. When the warning prompt appears, select Delete invoice.