Deleting an invoice is a permanent action.
Once the invoice is deleted Vinosmith will have no knowledge of that invoice. Vinosmith does not have a void option but we do have a method that will allow you to "mark" the invoice/order as void.
Go into the order that needs to be "voided"
In the order detail page and there is a dropdown for "Update" on the left side, click there
In that prompt, you can edit the invoice number. Add "-void" to the existing invoice number, so the new number would read "99-void"
Edit the order
If you need the inventory to go back into stock, just edit the order and 0 out the quantities
If you need to keep that inventory from going back into stock, leave the quantities but $0 the prices
You can use the notes field to make note of what/why/how it was voided
You now would be able to search on the orders page for the word "void" and it would bring up any invoices with that in the number.