You can create a new category by creating a new transaction, then in category dropdown , click on Add category , then a category will be added in your quickbook...
You can delete it's previous payment, and then it will show as unpaid if paid, steps you can proceed with by opening an invoice and then click on below link on ...
You can't restore that whole invoice with the invoice number, but you can create a different invoice with same information and set a custom invoice number for t...
